#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ll long long
#define ld long double
#define el "\n"
#define matrix vector<vector<int>>
#define pt complex<ld>
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ordered_multiset tree<ll, null_type,less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
using namespace std;
const ll N = 1e5 + 5, LOG = 20, INF = 1e18;
const ld pi = acos(-1);
const ll mod = 1e9 + 7;
const ld eps = 1e-12;
int dx[] = {0, 1, 0, -1, -1, 1, -1, 1};
int dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
ll n, m, x, y, k;
char ans[102][102];

void dowork() {
    cin >> n >> m >> k;
    if (k > min(n, m)) {
        cout << "Impossible" << el;
        return;
    }
    cout << "Possible" << el;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            ans[i][j] = '.';
        }
    }
    for (int i = 1; i <= k; i++) {
        ans[i][i] = '*';
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cout << ans[i][j];
        }
        cout << el;
    }
}

signed main() {
    fast
    //freopen("lis.in", "r", stdin);
    //freopen("bitwise.out", "w", stdout);
    int t = 1;
    //cin >> t;
    for (int i = 1; i <= t; i++) {
        dowork();
    }
    return 0;
}