import sys, time, random
from collections import deque, Counter, defaultdict
def debug(*x):print('debug:',*x, file=sys.stderr)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 61 - 1
mod = 998244353

x, y = input().split()

L = max(len(x), len(y))


x = x.zfill(L)
y = y.zfill(L)
ans = 'Yes'

for i in range(L):
    if x[i] >= y[i]:
        pass
    else:
        ans = 'No'
        
print(ans)