#include <bits/stdc++.h>
using namespace std;
void uniquePairs(int startingNumber, int endingNumber) {
int k = 0;
for (int i = startingNumber; i <= endingNumber; ++i) {
for (int j = startingNumber + k; j<= endingNumber; j++) {
cout << "(" << i << "," << j << ")" << endl;
}
++k;
}
}
int main() {
int startingNumber, endingNumber;
std::cout<<"Enter startingNumber: "<<std::endl;
std::cin >> startingNumber;
std::cout<<"Enter endingNumber: "<<std::endl;
std::cin >> endingNumber;
uniquePairs(startingNumber,endingNumber);
return 0;
}