import sys, math; sys.setrecursionlimit(10**8); sys.set_int_max_str_digits(0)
inf = 1<<60; MOD = 998244353
from bisect import bisect_left, bisect_right
from collections import deque, defaultdict, Counter
from itertools import product, combinations, permutations, groupby, accumulate
from heapq import heapify, heappop, heappush
def I():   return sys.stdin.readline().rstrip()
def II():  return int(sys.stdin.readline().rstrip())
def IS():  return sys.stdin.readline().rstrip().split()
def MII(): return map(int, sys.stdin.readline().rstrip().split())
def LI():  return list(sys.stdin.readline().rstrip())
def TII(): return tuple(map(int, sys.stdin.readline().rstrip().split()))
def LII(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LSI(): return list(map(str, sys.stdin.readline().rstrip().split()))
def GMI(): return list(map(lambda x: int(x) - 1, sys.stdin.readline().rstrip().split()))
def kiriage(a, b): return (a+b-1)//b
#def check(i:int, j:int): return 0 <= i < H and 0 <= j < W

A, B = IS()
N = len(A)
M = len(B)

if N < M:
    exit(print('No'))

B = B.rjust(N, '0')

for i in range(N):
    a = A[i]
    b = B[i]
    if a < b:
        exit(print('No'))
print('Yes')