#include <bits/stdc++.h>
using namespace std;
int main()
{

    cout<< "Total number of the students: ";
    int n;
    cin>> n;
    string name[n] , district[n];
    int age[n];
    cout<<"Name      Age       District"<<endl;
    for(int i=0; i<n; i++)
    {
        cin>> name[i] >> age[i]>> district[i];
    }


    cout<< "\nPrint all students details of age less than 20:\n";
    for(int i=0; i<n; i++) {
        if(age[i] < 20) {
            cout<< name[i] << " "<< age[i]<< " " << district[i]<< endl;
        }
    }


    cout<< "\nNumber of students of Rajshahi District:  ";

    int cnt= 0;

    for(int i=0; i<n; i++) {
        if(district[i] == "Rangpur" ) {
            cnt++;
        }
    }

    cout<< cnt<< endl;

    int cnt2=0;
     for(int i=0; i<n; i++) {
        if(name[i][0] == 'S' ) {
            cnt2++;
        }
    }
     cout<< "\nNumber of students name start with S:  "<< cnt2<< endl;
    return 0;
}