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#include <iostream>
using namespace std;
const int LIM = 105;
int R, C;
char G[LIM][LIM];
void solve() {
bool empty = true;
cin >> R >> C;
for (int i = 0; i < R; i++) {
for (int j = 0; j < C; j++) {
cin >> G[i][j];
empty = empty && G[i][j] == '.';
}
}
if (!empty && (R < 2 || C < 2)) {
cout << "Impossible" << endl;
return;
}
cout << "Possible" << endl;
for (int i = 0; i < R; i++) {
cout << string(C, empty ? '.' : '^') << endl;
}
}
int main() {
int T;
cin >> T;
for (int t = 1; t <= T; t++) {
cout << "Case #" << t << ": ";
solve();
}
return 0;
}
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