C :

#include<stdio.h>
int main()
{
	int a;
	scanf("%d",&a);
	printf("%d",a%10+a/10);
	return 0;
}

C++ :

#include<iostream>
using namespace std;
int main(){
   int n,s,g;
   cin>>n;   //从键盘读入二位数
   s = n / 10;  //取出十位存放到变量s中
   g = n % 10;  //取出个位存放到变量s中 
   cout<<s + g<<endl; 
}

Java :

import java.util.Scanner;

public class Main {
	 
    /**
     * @param args
     */
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int g = a%10;
		int s = a/10;
		int sum = g+s;
		System.out.println(sum);
		
	}
	public static void printArr(int [] a){
		for (int i = 0 ;i<= a.length - 1 ;i++) {
			System.out.print( a[i] + " ");
		}
	}
}

Python :

n=int(input())
s=n//10
g=n%10
print(s+g)