View Code of Problem 43

#include "stdlib.h"
#include "algorithm"
#include "iostream"
#include <cstdio>
#include "string"
#include <iomanip>
#include <map>
#include <set>
#include "math.h"
using namespace std;
map<int, bool> mp;
set<string> st;


int main()
{
	string str;
	cin >> str;
	for (int i = 0; i < str.length(); i++)
	{
		if (isalpha(str[i]))continue;
		str.erase(str.begin()+i);
		i--;
	}
	cout << str << endl;
	return 0;
}