def equivnum(conceito):
    match conceito:
        case 'A':
            eqv = 4
        case 'B':
            eqv = 3
        case 'C':
            eqv = 2
        case _:
            eqv = 0
    return eqv

c1 = input()
c2 = input()
c3 = input()
c4 = input()

eqv1 = equivnum(c1)
eqv2 = equivnum(c2)
eqv3 = equivnum(c3)
eqv4 = equivnum(c4)

ia = (eqv1 + eqv2 + eqv3 + eqv4) / 4

esta_aprovado = c1 != 'E' and c2 != 'E' and c3 != 'E' and c4 != 'E' and ia >= 3

print(esta_aprovado)