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#include <iostream>

#include <cstdio>

#include <cstdlib>

#include <algorithm>

#include <string>

using namespace std;

#define MAX 110

int a[MAX];

int main()

{

string a,b,killed,newp;

cin>>a>>b;

cout<<a<<" "<<b<<endl;

int n;

scanf("%d",&n);

while(n--)

{

cin>>killed>>newp;

if(a==killed){

a=newp;

}else{

b=newp;

}

cout<<a<<" "<<b<<endl;

}

return 0;

}