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#include<iostream>
#include<vector>
using namespace std;
int main(){
    int T, x, k, ret=-1;
    cin>>T;
    while(T--){
        cin>>x>>k;
        int ret = -1, t = x;
        while(t >= 1){
            if (t % 10 == k){
                ret = t;
                break;
            }
            t -= 2;
        }
        cout<<ret<<endl;
    }
    return 0;
}
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