broken_keyboard.cpp

#include <bits/stdc++.h>

using namespace std;
 
int main()
{
    string frase;
    list<char> texto;
    list<char>::iterator it;
    while(getline(cin,frase))
    {
        texto.clear();
        it = texto.begin();
        for(int i=0;i<frase.size();++i)
        {
        	if(frase[i] == '<'){
        		if(texto.empty())
        			continue;
        		else{
        			texto.pop_back();
        			//it--;
        		}
			}
			
        		
            if(frase[i]=='[')
                it = texto.begin();
            if(frase[i]==']')
                it = texto.end();
            if(frase[i]!='[' && frase[i]!=']' && frase[i] != '<')
                texto.insert(it,frase[i]);
        }
        for(it=texto.begin();it!=texto.end();it++)
            printf("%c",*it);
        printf("\n");
    }
    return 0;
}