#include<iostream>
#include<string>
int main(){
    int N;cin>>N;
    bool hasValid = false;
    for(int i=0; i<N; i++){
        string doorCode;
        int securityLevel;
        cin>>doorCode>>securityLevel;
        if(securityLevel >=50){
            cout<<doorCode<<":" securityLevel<<endl;
            hasValid = true;
        }
    }
    if(!hasvalid){
        cout<<"No valid doors"<<enld;
    }
    return 0;
}