#include <stdio.h>
#include <stdlib.h>
int sumofdigits(int n);

int main()
{
    int num,sum,max_sum=0,max_num=0;
    // asking the user to enter a number before the loop
    printf("enter number or -1 to stop\n");
    scanf("%d",&num);

    while(num!=-1)
    {
        sum=sumofdigits(num);
        //finding the maximum sum of the digits
        if(sum>max_sum)
        {
            max_sum=sum;
            max_num=num;
        }
        printf("enter number or -1 to stop\n");
        scanf("%d",&num);


    }
    // the final result
    printf("the number with the largest sum of digits is %d",max_num);

    return 0;
}
int sumofdigits(int n)
{
    int dig;
    int sum=0;
    while(n!=0)
    {
        dig=n%10;
        n=n/10;
        sum+=dig;
    }

    return sum;
}