#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
long long n, m;
if (!(cin >> n >> m)) return 0;
// k = m
cout << m << "\n";
for (long long i = 0; i < m - 1; ++i) cout << 'P';
cout << 'D' << "\n";
return 0;
}
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