Codeforces 776 A.Serial Killer-String直接比较是否相同

A Serial Killer

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

Our beloved detective, Sherlock is currently trying to catch a serial killer who kills a person each day. Using his powers of deduction, he came to know that the killer has a strategy for selecting his next victim.

The killer starts with two potential victims on his first day, selects one of these two, kills selected victim and replaces him with a new person. He repeats this procedure each day. This way, each day he has two potential victims to choose from. Sherlock knows the initial two potential victims. Also, he knows the murder that happened on a particular day and the new person who replaced this victim.

You need to help him get all the pairs of potential victims at each day so that Sherlock can observe some pattern.

Input

First line of input contains two names (length of each of them doesn't exceed 10), the two initials potential victims. Next line contains integer n (1 ≤ n ≤ 1000), the number of days.

Next n lines contains two names (length of each of them doesn't exceed 10), first being the person murdered on this day and the second being the one who replaced that person.

The input format is consistent, that is, a person murdered is guaranteed to be from the two potential victims at that time. Also, all the names are guaranteed to be distinct and consists of lowercase English letters.

Output

Output n + 1 lines, the i-th line should contain the two persons from which the killer selects for the i-th murder. The (n + 1)-th line should contain the two persons from which the next victim is selected. In each line, the two names can be printed in any order.

Examples

Input

ross rachel
4
ross joey
rachel phoebe
phoebe monica
monica chandler

Output

ross rachel
joey rachel
joey phoebe
joey monica
joey chandler

Input

icm codeforces
1
codeforces technex

Output

icm codeforces
icm technex

Note

In first example, the killer starts with ross and rachel.

After day 1, ross is killed and joey appears.

After day 2, rachel is killed and phoebe appears.

After day 3, phoebe is killed and monica appears.

After day 4, monica is killed and chandler appears.

这个题就是找下面的名字，有一样的就替换掉。

代码:

#include<bits/stdc++.h>
using namespace std;
const int N=1e4+;
int main(){
    string a[N],b[N];
    string aa,bb;
    int n,i;
    cin>>aa>>bb;
    cin>>n;
    for(i=;i<n;i++)
        cin>>a[i]>>b[i];
        cout<<aa<<" "<<bb<<endl;
        for(i=;i<n;i++){
            if(a[i]==aa){
                aa=b[i];          //哇，这里智障了，一开始写成aa==b[i]了，多写了一个=, 
                cout<<aa<<" "<<bb<<endl;
                continue;
            }
            if(a[i]==bb){
                bb=b[i];
                cout<<aa<<" "<<bb<<endl;
                continue;
            }
        }
        return ;
}

最近写的长得最好看的一个代码