diff --git a/du6/program.c b/du6/program.c
index 788e9b0..8b8104f 100644
--- a/du6/program.c
+++ b/du6/program.c
@@ -11,14 +11,14 @@ int main(){
     int count = 0;
     char temp[50];
 
-    for(int i =0; fgets(inputs[i], 50, stdin) != NULL;; i++){
+    for(int i =0; fgets(inputs[i], 50, stdin) != NULL; i++){
         if(i == 0){
             freePlaces = strtol(inputs[0], &ptr, 10);
-            if(freePlaces < 0 || !sdigit(freePlaces)){
+            if(freePlaces < 0 || !isdigit(freePlaces)){
                 printf("Nespravny vstup\n");
             }
         }
-        else if(i == 1 && !salpha(inputs[i][0])){
+        else if(i == 1 && !isalpha(inputs[i][0])){
             printf("Ziadne prihlasky\n");
             return 0;
         }
@@ -54,12 +54,12 @@ int main(){
 
     puts("Prijati studenti:\n");
     for(int i = 0; i < finalPosition; i++) {
-        puts ("%s\n", inputs[i]);
+        printf ("%s\n", inputs[i]);
         if(i == 4) break;
     }
     puts("Neprijati studenti:\n");
     for(int i = 5; i < finalPosition; i++){
-        puts("%s\n", inputs[i]);
+        printf("%s\n", inputs[i]);
     }
 
     free(ptr);