diff --git a/du1/program.c b/du1/program.c
index 2f76fbd..8f228e8 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -1,19 +1,19 @@
 #include <stdio.h>
 
 int main(){
-    while(1){
-        char ch;
-        int num = 'a' - 'A';
-        scanf("%c", &ch);
-        if(ch == EOF || ch == -1){
-            return 0;
-        }
-        if(ch <= 'A' && ch >= 'Z'){
-            ch += num;
-        }
-        else if(ch >= 'a' && ch <= 'z'){
-            ch -= num;
-        }
-        printf("%c", ch);
+
+    char ch;
+    int num = 'a' - 'A';
+    scanf("%c", &ch);
+    if(ch == EOF || ch == -1){
+        return 0;
     }
+    if(ch >= 'A' && ch <= 'Z'){
+        ch += num;
+    }
+    else if(ch >= 'a' && ch <= 'z'){
+        ch -= num;
+    }
+    printf("%c", ch);
+    
 }