1225A - Forgetting Things - CodeForces Solution

#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<stdio.h>
#include<cmath>
#include<algorithm>
#include<set>
#include<stack>
#include<deque>
#define   all(a)  sort(a.begin(),a.end());
using namespace std;

int main()
{
    long long a, b;
    cin >> a >> b;
    if (a == b)
        cout << a << 12 << " " << b << 13;
    else
    {
        if (a < b && b - a == 1)
            cout << a << 99 << " " << b * 100;
        else if (a == 9 && b == 1)
            cout << 9 << " " << 10;
        else
            cout << -1;
    }



    return 0;
}