a = list(map(int, input().split(".")))
b = list(map(int, input().split(".")))
ans = "NO"
if a[0] > b[0]:
    ans = "YES"
elif a[0] == b[0]:
    if a[1] > b[1]:
        ans = "YES"
    elif a[1] >= b[1]:
            ans = "YES"
print(ans)