A,B = map(int, input().split())

l = list(str(A))
lb = list(str(B))

a = 0
if A<B:
    print("No")
else:
    for j in range(1, len(lb)+1):
        if l[-j] < lb[-j]:
            print("No")
            break
        a+=1
        if a ==len(lb):
            print("Yes")