/*
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*/
#include <bits/stdc++.h>
#define sqr(x) (x * x)
#define cub(x) sqr(x) * (x)
#define all(x) x.begin() , x.end()
#define fp pop_front
#define bp pop_back
#define pf push_front
#define pb push_back
#define mp make_pair
#define sz size()                                                           
#define se second             
#define fi first
#define _ std::ios_base::sync_with_stdio(false); std::cin.tie(0); std::cout.tie(0);
using namespace std;
typedef long long ll;
typedef double dd;
typedef string st;
typedef char ch;
typedef unsigned long long ull;
typedef bool bl;
typedef long double ld;
typedef int I;
const ld pi = 3.14159265358979323846;                              	
const ll mod = 1e9 + 7;
const ll N = 5e5;
const ll INF = 1e9 + 1;
int n, a[N], id, ans;
st s;
int main () { _
    cin >> s;
    if (s[0] == '0' || s[s.sz - 1] == '1') {
        cout << -1;
        return 0;
    }
    for (int i = 0; i < (s.sz - 1) / 2; ++i) 
        if (s[i] != s[s.sz - i - 2]) {
            cout << -1; 
            return 0;
        }
    s[s.sz - 1] = '1';
    ans = 1;
    for (int i = 1; i <= s.sz; ++i) 
        if (s[i] == '1')  {
            for (int j = 1; j <= ans; ++j) 
                cout << i - j + 1 << " " << i + 1 << endl;
            ans = 1;
        } else 
            ans++;
    return 0;
}

Measured memory_bytes: 1616