diff --git a/src/fun.cpp b/src/fun.cpp
index 418f426..d9937d4 100644
--- a/src/fun.cpp
+++ b/src/fun.cpp
@@ -1,14 +1,134 @@
-// Copyright 2022 UNN-IASR
 #include "fun.h"
 
-unsigned int faStr1(const char *str) {
-    return 0;
+bool isSpace(char c)
+{
+    return c == ' ';
 }
 
-unsigned int faStr2(const char *str) {
-    return 0;
+bool isDigit(char c)
+{
+    return c >= '0' && c <= '9';
 }
 
-unsigned int faStr3(const char *str) {
-    return 0;
+bool isUpperLatin(char c)
+{
+    return c >= 'A' && c <= 'Z';
+}
+
+bool isLowerLatin(char c)
+{
+    return c >= 'a' && c <= 'z';
+}
+
+// Задача 1
+
+unsigned int faStr1(const char *str)
+{
+    if (str == nullptr)
+        return 0;
+
+    unsigned int count = 0;
+    int i = 0;
+
+    while (str[i] != '\0')
+    {
+        while (str[i] != '\0' && isSpace(str[i]))
+            i++;
+
+        if (str[i] == '\0')
+            break;
+
+        bool hasDigit = false;
+
+        while (str[i] != '\0' && !isSpace(str[i]))
+        {
+            if (isDigit(str[i]))
+                hasDigit = true;
+            i++;
+        }
+
+        if (!hasDigit)
+            count++;
+    }
+
+    return count;
+}
+
+// Задача 2
+unsigned int faStr2(const char *str)
+{
+    if (str == nullptr)
+        return 0;
+
+    unsigned int count = 0;
+    int i = 0;
+
+    while (str[i] != '\0')
+    {
+        while (str[i] != '\0' && isSpace(str[i]))
+            i++;
+
+        if (str[i] == '\0')
+            break;
+
+        bool valid = true;
+        int wordLength = 0;
+
+        if (!isUpperLatin(str[i]))
+            valid = false;
+
+        wordLength++;
+        i++;
+
+        while (str[i] != '\0' && !isSpace(str[i]))
+        {
+            if (!isLowerLatin(str[i]))
+                valid = false;
+
+            wordLength++;
+            i++;
+        }
+
+        if (valid && wordLength > 0)
+            count++;
+    }
+
+    return count;
+}
+
+// Задача 3
+
+unsigned int faStr3(const char *str)
+{
+    if (str == nullptr)
+        return 0;
+
+    unsigned int wordCount = 0;
+    unsigned int totalLength = 0;
+    int i = 0;
+
+    while (str[i] != '\0')
+    {
+        while (str[i] != '\0' && isSpace(str[i]))
+            i++;
+
+        if (str[i] == '\0')
+            break;
+
+        unsigned int currentLength = 0;
+
+        while (str[i] != '\0' && !isSpace(str[i]))
+        {
+            currentLength++;
+            i++;
+        }
+
+        totalLength += currentLength;
+        wordCount++;
+    }
+
+    if (wordCount == 0)
+        return 0;
+
+    return (totalLength + wordCount / 2) / wordCount;
 }
diff --git a/src/main.cpp b/src/main.cpp
index 89bbf61..d0b4683 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,25 @@
 // Copyright 2022 UNN-IASR
 #include "fun.h"
 
-int main() {
+#include <iostream>
+
+int main()
+{
+    const char *s1 = "abc test12 hello  world7 code";
+    const char *s2 = "Apple Orange banana Cat Dog X Yz John Smith A1 Test";
+    const char *s3 = "   one   three seven   ";
+
+    std::cout << "Строка 1: \"" << s1 << "\"" << std::endl;
+    std::cout << "faStr1 = " << faStr1(s1) << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "Строка 2: \"" << s2 << "\"" << std::endl;
+    std::cout << "faStr2 = " << faStr2(s2) << std::endl;
+    std::cout << std::endl;
+
+    std::cout << "Строка 3: \"" << s3 << "\"" << std::endl;
+    std::cout << "faStr3 = " << faStr3(s3) << std::endl;
+    std::cout << std::endl;
+
     return 0;
 }