C program to find the digit in a number from msb

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
 {
   int n,m,sum=0,a;
  int i;
  printf("Enter a no");
  scanf("%d",&n);
  printf("Enter position on which you want to find digit from left");
  scanf("%d",&a);
  m=n;

   while(n>0)
   {
    sum++;
    n=n/10;
   }
   if(a!=sum)
   {
    n=m/(pow(10,sum-a));
    n=n%10;
   }
   else
   {
    n=m%10;
   }
   printf("Digit that you want is %d",n);
   getch();
 }

output
Enter a no 4353
Enter position on which you want to find digit from left 4
Digit that you want is 3