#include <iostream>
#include <cstring>
#include <algorithm>
#include <limits.h>
#define REP(i,a,b) for(i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
/* ここからが本編 */
/*  */

int int_pow(int x,int n) {
   int res = 1;
   while(n > 0) {
      if(n&1) res = res * x;
      x = x * x;
      n >>= 1;
   }
   return res;
}
int main(void)
{
  int test = 1;
  int i,j,k,l;
  int a,b,c,d;
  char s[] = "0000000000";
  char rep_s[15];
  for(i=0;;i++) {
    c = 0;
    cout << s << endl;
    cin >> a >> rep_s;
    if(rep_s[0] == 'u') exit(0);
    for(j=1;j<10;j++) {
      s[i]++;
      cout << s << endl;
      cin >> b >> rep_s;     
      if(rep_s[0] == 'u') exit(0);
      if(a < b) break;
      else if(a > b) {
        s[i] = '0';
        break;
      }
    }
  }
  
  return 0;
}