#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
const int INF = 2e9;
int main() {
    int height;

    int res_max = -INF, res_min = INF;

    int tmp_max = -INF, tmp_min = INF;
    bool after_first_zero = false;
    while (cin >> height && height != 11111) {
        if(height == 0) {
            after_first_zero = true;

            res_max = max(res_max, tmp_max);
            res_min = min(res_min, tmp_min);

            tmp_max = -INF;
            tmp_min = INF;
        }
        else if(after_first_zero) {
            tmp_max = max(tmp_max, height);
            tmp_min = min(tmp_min, height);
        }
    }

    cout  << res_max - res_min << endl;



    return 0;
}