c++:

#include <bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin >> n;
cout << "So lien truoc n la:" << n + 1 << '\n';
cout << "So lien sau n la:" << n - 1;
}

Pas:

uses SysUtils;

var
  n: Integer;

begin
  ReadLn(n);
  WriteLn('So lien truoc n la: ', n + 1);
  WriteLn('So lien sau n la: ', n - 1);
end.

Python:

from sys import stdin, stdout

n = int(stdin.readline().strip())

stdout.write(f"So lien truoc n la: {n + 1}\n")
stdout.write(f"So lien sau n la: {n - 1}\n")

`@`Pascal

uses crt;
var x:int64;
begin
clrscr;
readln(x);
writeln(x+1);
writeln(x-1);
readln;
end.

`@`C++

#include<iostream>
using namespace std;
int main() {
long long x;
cin>>x;
cout<<x+1<<endl;
cout<<x-1<<endl;
return 0;
}

`@`Python

from sys import stdin, stdout
x = int(stdin.readline().strip())
stdout.write(f"So lien truoc n la: {x+1}\n")
stdout.write(f"So lien sau n la: {x-1}\n")