#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

string str;

bool force_remove(int i) {

for (; i < str.size(); i++) if (str[i] == '*') return true;

return false;

}

void solve(){

cin >> str;

int K; cin >> K;

int N = str.size();

int letters = 0;

for (auto c : str) if (c != '*' && c != '?') letters++;

string result = "";

for (int i = 0; i < N; i++) {

if (str[i] != '?' && str[i] != '*') {

if (i + 1 < N) {

if (str[i + 1] == '?') {

if (force_remove(i+2) || result.size() >= K) continue;

bool add = false;

int c = 0;

for (int j = i+2; j < N; j++) c += str[j] != '?' && str[j] != '*';

if (c + result.size() < K) result += str[i];

i++;

} else if (str[i + 1] == '*') {

if (force_remove(i+2) || result.size() >= K) continue;

bool add = false;

int c = 0;

for (int j = i+2; j < N; j++) c += str[j] != '?' && str[j] != '*';

while (c + result.size() < K) result += str[i];

i++;

} else result += str[i];

} else {

result += str[i];

}

}

}

if (result.size() != K) cout << "Impossible";

else cout << result;

}

int main()

{

cin.tie(0)->sync_with_stdio(false);

solve();

return 0;

}