a,b,c = list(map(int, input().split('.')))
x,y,z = list(map(int, input().split('.')))

def ton(a,b,c):
    return a * (1000) ** 2 + b * (1000) ** 1 + c

old = ton(a,b,c) > ton(x,y,z)
if old:
    print('YES')
else:
    print('NO')