# No.138 化石のバージョン
fossil = [int(i) for i in input().split('.')]
target = [int(j) for j in input().split('.')]

is_fossil = 'NO'

if fossil[0] > target[0]:
    is_fossil = 'YES'
elif fossil[0] == target[0]:
    if fossil[1] > target[1]:
        is_fossil = 'YES'
    elif fossil[1] == target[1]:
        if fossil[2] > target[2]:
            is_fossil = 'YES'
        elif fossil[2] == target[2]:
            is_fossil = 'YES'

print(is_fossil)