#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define pii pair<int,int>
#define ff first
#define ss second
using namespace std;
#define debug(args...) kout("[ " + string(#args) + " ]", args)
void kout() { cerr << endl; }
template <class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ',kout(b...); }
template <class T> void pary(T L, T R) { while (L != R) cerr << *L << " \n"[++L==R]; }
int N, K, T;
string S;
int now;
vector <int> arr;
vector <bool> vis;
signed main() {
ios_base::sync_with_stdio(0), cin.tie(0);
cin >> N >> K >> T >> S;
for (int i = 0; i < (1<<N); i++) {
if (__builtin_popcount(i) == K)
arr.pb(i);
}
if (K % 2 == 0) {
cout << -1 << '\n';
return 0;
}
cout << (1<<N) << '\n';
vis.resize(1<<N);
for (int i = N-1; i >= 0; i--)
now += (1<<i) * (S[i] == '1');
for (int i = 0; i < (1<<N); i++) {
for (int j = 0; j < N; j++)
cout << (((1<<j)&now)>0);
cout << '\n';
vis[now] = true;
for (int j : arr) {
if (!vis[now ^ j]) {
now ^= j;
break;
}
}
}
}
