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#include <bits/stdc++.h>
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using namespace std;
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int a[1001] = {0};
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int main() {
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//输入+输出重定向
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freopen("../1133.txt", "r", stdin);
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int n, q;
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//n:图书馆里书的数量,q:读者的数量
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cin >> n >> q;
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//接下来的 n 行,每行包含一个正整数,代表图书馆里某本书的图书编码。
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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sort(a + 1, a + n + 1);
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//接下来的 q 行,每行包含两个正整数,以一个空格分开,第一个正整数代表图书馆里读者的需求码的长度,第二个正整数代表读者的需求码
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for (int i = 1; i <= q; ++i) {
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int x, y;
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cin >> x >> y;
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//从a中去遍历查找,如果是以x位10取模,命中就是解
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bool found = false;
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for (int j = 1; j <= n; ++j) {
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if (a[j] % int(pow(10, x)) == y) {
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found = true;
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cout << a[j] << endl;
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break;
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}
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}
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if (!found) cout << -1 << endl;
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}
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//关闭文件
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fclose(stdin);
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return 0;
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}
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