diff --git a/a1/program.c b/a1/program.c
index 89e682c..8a09676 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -16,7 +16,7 @@ int main () {
             break;
 
         for(int j = 0; input[j] != '\0' && input[j] != '\n'; j++)
-            if(!isdigit(input)){
+            if(!isdigit(input[j])){
                 printf("Nepodarilo sa nacitat polynom na %d mieste.\n", i+1);
                 return 0;
             }