#include <stdio.h>
#include <string.h>
#include <math.h>
int main(void) {
  char str[] = "000";
  char ans[] = "000";
  

  while (1) {
    scanf("%s", ans);
    if (strcmp(str,ans) == 0) {
      break;
    }
    printf("locked\n");
  }
  printf("unlocked\n");
  
  return 0;
}