diff --git a/cv1/program.c b/cv1/program.c
index 3aa9d33..427efa4 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -1 +1,16 @@
-#include
+#include <stdio.h>
+
+int main() {
+    char ch;
+    int line_count = 0;
+
+    while ((ch = getchar()) != EOF) {
+        if (ch == '\n') {
+            line_count++;
+        } else {
+            putchar((ch >= 'a' && ch <= 'z') ? (ch - 32) : ((ch >= 'A' && ch <= 'Z') ? (ch + 32) : (ch >= 32 && ch <= 126 ? ch : '\0')));
+        }
+    }
+
+       return 0;
+}
\ No newline at end of file