#include <iostream>
using namespace std;

int main() {
	int month[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
	int mon;
	int x, y,sum;
	int ans = 0;

	for (mon = 0; mon < 12; mon++) {
		for (x = 0; x <= month[mon]/10; x++) {
			for (y = 0; y < 10; y++) {
				if (month[mon]/10 == x && y > month[mon]%10) {
					break;
				}
				if (mon + 1 == x + y) {
					cout << x << ' ' << y << endl;
					ans++;
				}
			}
		}
	}

	cout << ans << endl;
}