#include <iostream>

#include <string>

using namespace std;

int main()

{

string str;

while(cin>>str)

{

//char c = str.at(1);

//cout<<c;//input abc, return b

//cout<<str.capacity()<<endl;//return str's size,but must be 4n;

//str.clear();

//cout<<str;

//cout<<str.compare("abc");//same as strcmp()

//cout<<str.find_first_of('o');//find first pos of 'o'

//cout<<str.append("abc");//add "abc" after str

//cout<<*str.begin();//same as begin() in vector,so is end()

//int flag = str.find("ab");//return the pos of "ab" in str,-1 will return if not find

//cout<<str.length()<<endl;//return str's length,example:"abc"->3

//str.erase(str.begin());//remove the char which is pointed by iterator

//cout<<str.find_last_of('o')<<endl;//find last pos of char

//str.push_back('a');//pushback one char

}

return 0;

}