string tokenization

// https://www.geeksforgeeks.org/tokenizing-a-string-cpp/
#include<bits/stdc++.h>
using namespace std;

string str,x;
vector<string>tokens;

int string_to_int(string now)
{
    int ret=0,i;
    for(i=0;i<now.size();i++){
        ret=(ret*10+(now[i]-'0'));
    }
    return ret;
}


int main()
{
    freopen("input.txt","r",stdin);

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int i,j;
    cin>>str;
    stringstream ss(str);
    while(getline(ss,x,',')){
        tokens.push_back(x);
    }

    for(auto xx : tokens)cout<<xx<<endl;

    cout<<"============"<<endl;

    for(i=1;i<tokens.size();i+=2){
        int now=string_to_int(tokens[i]);
        cout<<now<<endl;
    }
}