# coding=utf-8:

lineA = input().split('.')
lineB = input().split('.')

for i, num in enumerate(lineA):
    lineA[i] = int(num)
    
for j, num in enumerate(lineB):
    lineB[j] = int(num)

c = 0
for a, b in zip(lineA, lineB):
    if a < b:
        print("NO")
        break
    elif a >= b:
        c += 1
        if c == 3:
            print("YES")
            break
        else:
            continue