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if __name__ == '__main__':
    k = 0
    succ = 0
    input()
    while succ < 20:
        k += 1
        s, x = input().split(' ')
        x = int(x)
        if s == 'NIE':
            continue
        if succ > 10 and x >= 2:
            continue
        print(k, ' ', end='')
        succ += 1