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#include <iostream>
#include <cstring>
#include <stdio.h>
using namespace std;
char s[1000];
int subs[1000][2],tot;
int main()
{
    string s;
    getline(cin,s);
    tot=0;
    bool in=false;
    for(int i=0;i<s.length();i++){
        if(i<s.length()&&s[i]=='@'){
            if(in)tot++;
            subs[tot][0]=i+1;
            subs[tot][1]=i;
            in=true;
        }else if(in){
            if(('a'<=s[i]&&s[i]<='z')||('A'<=s[i]&&s[i]<='Z'))
                subs[tot][1]++;
            else{
                tot++;
                in=false;
            }
        }
    }
    if(in){
        if(('a'<=s[s.length()-1]&&s[s.length()-1]<='z')||('A'<=s[s.length()-1]&&s[s.length()-1]<='Z')){
            subs[tot++][1]++;
        }
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