A - TEX Quotes
#include<iostream>
#include<stdio.h>
#include<string>
using namespace std;
int main(){
string s,ss;
bool dou=false,single=false;
char c;
while(scanf("%c",&c)!=EOF){
getline(cin,ss);
s = c+ss;
for(int i=0;i<s.size();i++)
if(s[i]=='"')
if(dou){
dou=false;
cout<<"''";
}
else {
dou = true;
cout<<"``";
}
else
cout<<s[i];
cout<<endl;
}
return 0;
}