import sys

l = 0
r = 1001
m = 500
temp = m

for i in range(10):
    print(m)
    sys.stdout.flush()

    term = input()

    if term == "correct":
        exit()
    elif term == "lower":
        temp = m
        m = (l + m) // 2
        r = temp
    else:
        temp = m
        m = (m + r) // 2
        l = temp