def oi(): return int(input())
def os(): return input().rstrip()
def mi(): return list(map(int, input().split()))

# import sys
# input = sys.stdin.readline
# import sys
# sys.setrecursionlimit(10**8)
# import pypyjit
# pypyjit.set_param('max_unroll_recursion=-1')
input_count = 0

A,B = mi()
def check(A,B):
    A = str(A)
    B = str(B).rjust(len(A), "0")
    for a,b in zip(A,B):
        if int(a) < int(b):
            return False
    return True

if check(A,B):
    print("Yes")
else:
    print("No")