#include <iostream>
#include <stdlib.h>

//put additional include lines here as needed
//include <packageName>

using namespace std;
int main()
{
int dontend; // So program doesn't close on end
int i = -1; //Need negative one
char numb[100];
char check ='-1';
int final;
int highest;
numb[i-1]= 0;

cout << "Please enter positive integers, when finished enter '-1':" << endl;

do
{
 i = i+1;
 cin >> numb[i];
} while(numb[i] != check);

final = i;

for (i=0; i <= final; i++)
{
 if (numb[i] > numb[i-1])
 {
   highest = numb[i];
 }
}
cout << highest;
cin >> dontend; //So program doesn't close on end
}