#include<bits/stdc++.h>
#include <cstdio>
using namespace std;
void read(int &h){
    char o;
    int x=0,y=1;
    o=getchar_unlocked();
    while(!(o<='9'&&o>='0')){
        if(o=='-'){
            y=-1;
        }
        o=getchar_unlocked();
    }
    while(o<='9'&&o>='0'){
        x*=10;
        x+=o-'0';
        o=getchar_unlocked();
    }
    h=x*y;
    return ;
}
struct tree{
    char lc,rc;
}a[1000000];
int n;
char root,child;
void dfs(char now){
    if(now=='*'){
        return;
    }
    cout<<now;
    dfs(a[now].lc);
    dfs(a[now].rc);
    return;
}
int main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n;
    cin>>root>>a[root].lc>>a[root].rc;
    for(int i=2;i<=n;i++){
        cin>>child>>a[child].lc>>a[child].rc;
    }
    dfs(root);
    return 0;
}