Nothing, it will just keep sending you annoying notifications that become more and more frequent, i would just confirm it if i were you
        
             
        
        
        
Answer:
In C++:
#include <iostream>
using namespace std;
int main(){
    string fname,lname; int num;
    cout<<"Firstname: "; cin>>fname;
    cout<<"Lastname: "; cin>>lname;
    cout<<"4 digits: "; cin>>num;
    string login = lname;
    if(lname.length()>=5){
        login = lname.substr(0, 5);    }
    login+=fname.substr(0,1)+to_string(num%100);
    cout<<login;
    return 0;
}
Explanation:
See attachment for explanation where I used comments to explain each line
 
        
             
        
        
        
It is known as the PACING Calendar.