A,B = input().split()
A_num = int(A)
B_num = int(B)

A = list(map(int,reversed(list(A))))
B = list(map(int,reversed(list(B))))

for a,b in zip(A,B):
    if a >= b:
        print("Yes")
        exit()

# if A_num <= B_num:
#     print("Yes")
#     exit()

print("No")