A = input().split(".")
B = input().split(".")
if int(A[0]) > int(B[0]):
    print("YES")
elif int(A[0]) == int(B[0]):
    if int(A[1]) > int(B[1]):
        print("YES")
    elif int(A[1]) == int(B[1]):
        if int(A[2]) >= int(B[2]):
            print("YES")
        else:
            print("NO")
    else:
        print("NO")
else:
    print("NO")