#include <bits/stdc++.h>

using namespace std;

int main() {
    int T;
    cin >> T;
    assert(T >= 1 && T <= 50);
    while (T--) {
        string s;
        cin >> s;
        assert(s.size() >= 1 && s.size() <= 100000);
        int a, b;
        cin >> a >> b;
        int A = a, B = b;
        assert(a >= 1 && a <= s.size());
        assert(b >= 1 && b <= s.size());
        int cntA = 0, cntB = 0;
        for (char ch: s) {
            if (ch == 'a') {
                cntA++;
            } else if (ch == 'b') {
                cntB++;
            } else {
                assert(false);
            }
        }
        char first = 'a', second = 'b';
        if ((cntA + a - 1) / a <= (cntB + b - 1) / b) {
            swap(first, second);
            swap(a, b);
            swap(cntA, cntB);
        }
        vector<pair<char, int> > parts;
        int remA = cntA, remB = cntB;
        int a_parts = (cntA + a - 1) / a;
        for (int i = 0; i < (cntA + a - 1) / a; i++) {
            parts.push_back({first, min(a, remA)});
            remA -= min(a, remA);
            if (remB > 0) {
                parts.push_back({second, 1});
                remB--;
            } else if (i + 1 < a_parts) {
                parts.push_back({'*', 1});
            }
        }
        assert(remA == 0);
        for (int i = 1; i < parts.size(); i += 2) {
            parts[i].second += min(remB, b - 1);
            remB -= min(remB, b - 1);
        }
        assert(remB == 0);
        string ans = "";
        for (auto it: parts) {
            for (int i = 0; i < it.second; i++) {
                ans += it.first;
            }
        }
        /*
        cerr << "s " << s << endl;
        cerr << "a " << a << " " << " b " << b << endl;
        cerr << "ans " << ans << endl;
        */
        int cA = 0, cB = 0;
        for (int i = 0; i < ans.size(); i++) {
            if (ans[i] == 'a') {
                cA++;
                cB = 0;
            } else if (ans[i] == 'b') {
                cB++;
                cA = 0;
            } else {
                cA = cB = 0;
            }
            assert(cA <= A && cB <= B);
        }
        cout << ans << endl;
    }
    return 0;
}