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()
flg = True
A = str(A)
B = str(B).rjust(len(A), "0")
for a,b in zip(A,B):
    flg = flg and (int(a) >= int(b))
if flg:
    print("Yes")
else:
    print("No")