#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <set>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;

using Modint = atcoder::static_modint<998244353>;


int main(){
    vector<i64> X;
    i64 a,b,c; cin >> a >> b >> c;
    if((c+b)%a == 0) X.push_back((c+b)/a);
    if(c <= b) if(c%a == 0) X.push_back(c/a);
    if(X.empty()){ cout << "-1\n"; }
    else {
        sort(X.begin(), X.end());
        rep(i,X.size()) cout << X[i] << '\n';
    }
}



struct ios_do_not_sync{
    ios_do_not_sync(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;