#include <bits/stdc++.h>

using namespace std;

int getrand(int a, int b) {
    random_device rd; //Get a random seed from the OS entropy device, or whatever
    mt19937_64 eng(rd()); //Use the 64-bit Mersenne Twister 19937 generator
    //and seed it with entropy.

    //Define the distribution, by default it goes from 0 to MAX(unsigned ll)
    //or what have you.
    uniform_int_distribution<unsigned int> distr;
    return min(a, b) + distr(eng) % (max(a, b) - min(a, b) + 1);
}

int main()
{
    int n = getrand(1, 15);
    cout << n << " " << getrand(1, 50) << endl;
    for(int i = 0; i < n; i++) {
        int a = getrand(0, 50), b = getrand(0, 50);
        while(a == b) {
            a = getrand(0, 50);
            b = getrand(0, 50);
        }
        cout << min(a, b) << " " << max(a, b) << endl;
    }
    return 0;
}