#include <stdio.h>
int main(void) {
int input;
switch(input){
case 3: case 4: case 5:
break;
case 6: case 7: case 8:
break;
case 9: case 10: case 11:
break;
case 12: case 1: case 2:
break;
default:
printf("Month doesn't exist!"); }
return 0;
}
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