/*
 * ????cout.cpp
 * ????: 2012-12-11
 * ??: winneshaw
 * ??????????????s??????s1?
 *  ?????s1??????????s???????ASCII????????ASCII????????????
 *  ?????s???????ASCII????????ASCII????????????
 *  ????????????s?????????
 *  ??????????????????s???????ASCII??s???????ASCII??
 */


int main(){
	char str[1000];
	cin.getline(str,1000,'\n');
	char*p=str;
	int lenth=strlen(str);
	int i;
	for(i=0;i<lenth-1;i++)
		cout<<(char)(*(p+i)+*(p+i+1));
	cout<<(char)(*p+*(p+lenth-1))<<endl;
	return 0;
}
