I tested my program several times but I can't find what's wrong with it please help !
my program :


#include<iostream>
#include<stdio.h>
using namespace std;

int main()
{
    char a[1000000];
    cin>>a;
    int i;
    int counter=0;
    int maxint=0;
    for(i=0;i<strlen(a);i++)
    {
        if(a[i]>64){
            if(maxint<a[i]-55)
                maxint=a[i]-55;
            counter+=a[i]-55; }
        else {
        if(maxint<a[i]-48)
                maxint=a[i]-48;
            counter+=a[i]-48; }
    }
    for(i=1;i<36;i++)
    {
        if((counter%i==0)&&(maxint<i))
        {
            cout<<i+1;
            return 0;
        }
    }
    cout<<"No solution.";
    return 0;

}