A, B = input().split()
A = list(A)
B = list(B)

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

for i in range(len(A)):
    if int(A[i]) < int(B[i]):
        print("No")
        break
else:
    print("Yes")