#include <iostream>
#include <cstring>
#define MAX_LENGTH 10000000
using namespace std;
int main()
{
char* sin = new char[MAX_LENGTH];
cout << ">";
cin >> sin;
size_t len = strlen(sin);
char str[len+1] = {'\0'};
strcpy(str,sin);
delete [] sin;
while(true)
{
char str2[len+1] = {'\0'};
int f = 0;
int strc = 0;
for(int i = 0; i<len;i++)
{
if(f==0)
{
if(str[i] == str[i+1])
{
f++;
}
else
{
str2[strc] = str[i];
strc++;
}
}
else if (f==1)
{
if(str[i] != str[i-1])
{
str2[strc] = str[i];
strc++;
f++;
}
}
else
{
str2[strc] = str[i];
strc++;
}
}
strcpy(str,str2);
if(f == 0) break;
}
cout << str << "\n\0";
}