#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
 
using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
 
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<ld,ld> pdd;
 
#define ff(i,a,b) for(int i = a; i <= b; i++)
#define fb(i,b,a) for(int i = b; i >= a; i--)
#define trav(a,x) for (auto& a : x)
 
#define sz(a) (int)(a).size()
#define pb push_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

template<typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

// os.order_of_key(k) the number of elements in the os less than k
// *os.find_by_order(k)  print the k-th smallest number in os(0-based)

const int mod = 1000000007;
const int inf = 1e9 + 5;
const int mxN = 200005; 

int a, b;
string s;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    cin >> s >> a >> b;

    if(abs(a - b) > 1){
    	cout << "nemoguce" << '\n';
    	return 0;
    }

    if(b > a){
    	swap(s[0], s[1]);
    	swap(a, b);
    }

    ff(i,1,a + b){
    	if(i % 2 == 1)cout << s[0];
    	else cout << s[1];
    }

    cout << '\n';

    return 0;
}
/*
 

 
// probati bojenje sahovski
*/