#include <iostream>
#include <string>
using namespace std;
int main(){
    int n;
    cin>>n;
    string doorcode;
    int securitylevel;
    for(int i=0;i<n;i++){
        cin>>doorcode>>securitylevel;
        if(doorcode!="A1" && doorcode!="B2" && doorcode!="C3" && ){
            cout<<"No valid doors";
        }
        else if(securitylevel>=50){
            cout<<doorcode<<":"<<securitylevel<<endl;
        }
    }
    return 0;
}