diff --git a/cv3/program.c b/cv3/program.c
index 0fbd54b..8f52936 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -15,12 +15,10 @@ int main(){
     memset(&mystack,0,sizeof(struct stack));
     char vstup[STACK_SIZE];
     int counter = 0;
-    char str[9]="no input";
-    char *istr;
     while(1){
         fgets(vstup, STACK_SIZE, stdin);
-        istr = strstr(str,vstup);
-        if(vstup[0] == '\n' || istr != NULL){
+        vstup[strcspn(vstup, "\n")] = 0;
+        if(strlen(vstup) == 0){
             break;
         }
         if(vstup[0] == '-' || vstup[0] == '+' || vstup[0] == '*' || vstup[0] == '/'){