#include <bits/stdc++.h>

using namespace std;

const int INF = 1e9;
using ll = long long;
using inv = vector<int>;
using stv = vector<string>;
using pint = pair<int,int>;
#define FOR(i,l,r) for(int i=(l); i<(r); i++)
#define rep(i,r) for(int i=0; i<(r); i++)
#define repl(i,r) for(long long i=0; i<(r); i++)
#define FORl(i,l,r) for(long long i=(l); i<(r); i++)
#define INFL ((1LL<<62)-(1LL<<31))
#define pb(x) push_back(x)
#define CIN(x) cin >> x



int main(){
    int N,M,K; cin >> N >> M >> K;

    string front = "";

    string mid = "";

    string end = "";
    
    int zero = 0;
    int one = 0;

    int eone = -1;
    if(K != 0){
        rep(i,K+1){
            if(i % 2){
                mid.pb('1');
                one++;
                eone = i;
            }
            else{
                mid.pb('0');
                zero++;
            }
            
        }
    }
    //cout << "mid:" << mid << " one:" << one << " zero:" << zero << "\n";

    if(one > M || zero > N){
        cout << -1 << endl;
        return 0;
    }

    N -= zero;
    M -= one;

    eone += N;
    rep(i,N) front.pb('0');
    rep(i,M) end.pb('1');

    cout << eone << endl;
    if(eone != -1 && K % 2 == 0) mid.insert(eone,end);
    else if(eone != -1) mid.insert(eone-1,end);
    cout << front << mid << "\n";
    return 0;
}