#include <iostream>
using namespace std;
void out(int n, int curr = 0)
{
if (n < curr) return;
cout << curr << endl;
out(n,curr+1);
}
int main(int argc, const char * argv[])
{
int m, M;
cout << "From: "; cin >> m;
cout << "To : "; cin >> M;
out(M,m);
}
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