#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import array
import collections
import sys


MAX_D = 10
Status = collections.namedtuple("Status", "digits, status")


def submit_guess(guess_sequence):
    def array_to_int(sequence):
        tens = (10 ** k for k in range(MAX_D)[::-1])
        return sum(x * y for x, y in zip(sequence, tens))
    print("{:0=10d}".format(array_to_int(guess_sequence)))
    sys.stdout.flush()
    d, s = input().split()
    return Status(int(d), s == "unlocked")


def main():
    guess_sequence = array.array("B", (0 for _ in range(MAX_D)))
    prev_digits, prev_status = submit_guess(guess_sequence)
    digits, status = prev_digits, prev_status
    if status:
        return
    for place in range(MAX_D)[::-1]:
        for digit in range(10):
            guess_sequence[place] = digit
            digits, status = submit_guess(guess_sequence)
            if status:
                return
            elif prev_digits < digits:
                prev_digits = digits
                break
            elif prev_digits > digits:
                guess_sequence[place] = max(digit - 1, 0)
                digits = prev_digits
                break
            else:
                continue


if __name__ == '__main__':
    main()