FOSSIL = input()
J = input()
f = 0
g = 0
for i in range(3):
    while len(FOSSIL) > 0 and FOSSIL[0] != ".":
        f *= 10
        f += int(FOSSIL[0])
        FOSSIL = FOSSIL[1:]
    if len(FOSSIL) > 0:
        FOSSIL = FOSSIL[1:]
    while len(J) > 0 and J[0] != ".":
        g *= 10
        g += int(J[0])
        J = J[1:]
    if len(J) > 0:
        J = J[1:]
    if f < g:
        print("NO")
        exit()
    elif f > g:
        print("YES")
        exit()
print("YES")