#include <iostream>
using namespace std;
 
const int TEN = 10;
 
int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        int reverse = 0;
        while (x) {
            reverse = reverse * TEN + x % TEN;
            x /= TEN;
        }
        while (y > 1) {
            reverse /= TEN;
            --y;
        }
        if (x < 0) {
        	reverse *= -1;
        }
        cout << reverse % TEN << '\n';
    }
    return 0;
}

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