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n = int(input())

ans = []
i = 0
while i < n and len(ans) < 10:
    s, x = input().split(' ')
    i += 1
    if s == 'NIE':
        continue

    ans += [i]

    x = int(x)

while i < n and len(ans) < 20:
    s, x = input().split(' ')
    i += 1
    if s == 'NIE':
        continue

    x = int(x)
    if x > 1:
        continue

    ans += [i]

print(' '.join(map(str, ans)))