diff --git a/du6/program.c b/du6/program.c
index 323c497..48a62b6 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -11,13 +11,19 @@ int main() {
     char* ptr;
     int finalPosition;
     int count = 0;
-    char temp[50];
 
     for(int i = 0; fgets(inputs[i], 50, stdin) != NULL; i++){
         if(i == 0){
+            inputs[i][strlen(inputs[i])-1] = '\0'
+            for(int j = 0; j < strlen(inputs[i]); j++){
+                if(!isdigit(inputs[i][j])){
+                    printf("Nespravny vstup\n");
+                    return 0;
+                }
+            }
             freePlaces = (int)strtol(inputs[i], &ptr, 10);
             if(freePlaces < 0){
-                printf("Nespravny vstup\n", freePlaces);
+                printf("Nespravny vstup\n");
                 return 0;
             }
         }