from sys import stdin, stdout
def check(code):
    stdout.writelines(''.join(map(str, code)))
    stdout.flush()
    s = stdin.readline().split()
    if s[1][0]=='u': exit(0)
    return int(s[0])
pw = [0]*10
f = check(pw)
i = 0
while 1:
    r = pw[i]
    pw[i] = (r+1)%10
    fn = check(pw)
    if f>fn:
        pw[i] = r
        i += 1
    else:
        f = fn