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def main():
    input()
    strin = ''
    qual = 0
    licznik = 0
    while qual <=10:
        licznik +=1
        zaw = input().split()
        if zaw[0] == 'NIE':
            continue

        qual += 1
        strin += f' {licznik}'

    while qual <20:
        licznik +=1
        zaw = input().split()
        if zaw[0] == 'NIE' or int(zaw[1]) >= 2:
            continue

        qual += 1
        strin += f' {licznik}'
    return strin






if __name__ == "__main__":
    print(main()[1:])