#include <stdio.h>
#include <stdlib.h>
#include <time.h>
char *str = NULL;
size_t size;
int used[999] = {};
int main() {
  srand((unsigned)time(NULL));
  while (1) {
    int i = 0;
    while (used[i]) {
      i = rand() % 1000;
      used[i] = 1;
    }
    printf("%03d\n", i);
    fflush(stdout);
    getline(&str, &size, stdin);
    if (str[0] == 'u') return 0;
  }
}