broevi

#include <iostream>

using namespace std;

int main()
{
    int i=0, l, r, x, x1, x2, x3, x4;
    cin >> l >> r;
    for( ;l<=r; l++)
    {
        x = l;
        x4=x%10;
        x/=10;
        x3=x%10;
        x/=10;
        x2=x%10;
        x/=10;
        x1=x%10;
        x/=10;
        if(x1<x2 and x2<x3 and x3<x4)i++;
    }
    cout << i;
    return 0;
}