#include using namespace std; typedef long long ll; #define F first #define S second #define pii pair #define eb emplace_back #define all(v) v.begin(), v.end() #define rep(i, n) for (int i = 0; i < n; ++i) #define rep3(i, l, n) for (int i = l; i < n; ++i) #define chmax(a, b) a = (a >= b ? a : b) #define chmin(a, b) a = (a <= b ? a : b) #define out(a) cout << a << endl #define outa(a, n) rep(_, n) cout << a[_] << " "; cout << endl #define SZ(v) (int)v.size() #define inf (int)(1e9+7) #define abs(x) (x >= 0 ? x : -(x)) int main() { ios::sync_with_stdio(false); cin.tie(0); string s; cin >> s; int a[26] = {0}; rep(i, 13) a[s[i] - 'a']++; outa(a, 26); rep(i, 13) { if (a[i] != 1) break; if (i == 12) { rep(j, 13) out((char)('a' + j)); return 0; } } int c = 0, p = -1; rep(i, 13) { if (a[i] > 2) { out("Impossible"); return 0; } if (a[i] == 2) c++; if (a[i] == 0) p = i; } if (c >= 2) { out("Impossible"); return 0; } out((char)('a' + p)); }