from sys import stdin, stdout
input = lambda: stdin.readline().rstrip()
write = stdout.write

def main():
    num = ['0'] * 10
    num.append('\n')
    for i in range(10):
        for j in range(10):
            num[i] = str(j)
            write(''.join(num))
            x, lock = input().split()
            x = int(x)
            if lock == 'unlocked':
                return
            elif x > i:
                break

main()