#include<iostream>
using namespace std ;
int main(){
    int n ;
    cin>>n;
    string name[n] ;
    int s[n] ;
    bool found = false ;
    if(n<1||n>=10){
        cout<<"No valid doors";
        return 0;
    }
    else{
    for(int i = 0;i<n;i++){
        cin>>name[i]>>s[i];
        if(s[i]<=0||s[i]>100){
            cout<<"No valid doors";
            return 0;
        }
    }
        for(int i = 0;i<n;i++){
        if(s[i]>=50){
            cout<<name[i]<<":"<<s[i]<<endl;
            found =true ;
        }
        }
        if(!found{
            cout<<"No valid doors";
            
        }
        
    
    }
}