A, B = input().split()

A = list(A)
B = list(B)

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

while len(B) < len(A):
    B.insert(0, '0')

while len(A) < len(B):
    A.insert(0, '0')

isok = True

for i in range(len(A)):
    if not (A[i] >= B[i]):
        isok = False

if isok:
    print("Yes")
else:
    print("No")