diff --git a/du3/program.c b/du3/program.c
index 66ed67d..490e9fd 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -18,7 +18,7 @@ void print_stack(struct stack *s) {
 
 void push_stack(struct stack *s, float value) {
    if (s->size >= STACK_SIZE) {
-      printf("no input\n");
+      printf("full stack\n");
       exit(0);
    }
    s->values[s->size] = value;
@@ -27,7 +27,7 @@ void push_stack(struct stack *s, float value) {
 
 float pop_stack(struct stack *s) {
    if (s->size <= 0) {
-      printf("no input\n");
+      printf("not enough operands\n");
       exit(0);
    }
    s->size--;
@@ -45,7 +45,7 @@ int main() {
           strcmp(input, "*") == 0 || strcmp(input, "/") == 0) {
 
          if (s.size < 2) {
-            printf("no input\n");
+            printf("not anough operands\n");
             exit(0);
          }
 
@@ -65,7 +65,7 @@ int main() {
          char *endptr;
          float val = strtof(input, &endptr);
          if (*endptr != '\0') {
-            printf("no input\n");
+            printf("division by zero\n");
             exit(0);
          }
          push_stack(&s, val);