n=int(input())
l=input().split()
l1=[int(num) for num in l]
l1.sort()
a,b=0,0
if len(l1)==1:print(-1)
else:
a+=l1[0]
b+=sum(l1[1:])
if a==b:print(-1)
else:
print(1)
print(str(l.index(str(a))+1))
#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
int A[n];
for(int i = 0 ; i < n ; i++){
cin>>A[i];
}
if((n==0)||(n==1)||(A[0] == A[n-1] && n == 2)){
cout<<"-1"<<endl;
}
else{
int min=INT_MAX;
int index=-1;
cout<<1<<endl;
for(int i = 0 ; i<n ; i++){
if(A[i]<min){
min=A[i];
index=i;
}
}
cout<<index+1;
}
}1663C - Pōja Verdon | 1497A - Meximization |
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540A - Combination Lock | 1553C - Penalty |
1474E - What Is It | 1335B - Construct the String |
1004B - Sonya and Exhibition | 1397A - Juggling Letters |
985C - Liebig's Barrels | 115A - Party |
746B - Decoding | 1424G - Years |
1663A - Who Tested | 1073B - Vasya and Books |
195B - After Training | 455A - Boredom |
1099A - Snowball | 1651D - Nearest Excluded Points |
599A - Patrick and Shopping | 237A - Free Cash |
1615B - And It's Non-Zero | 1619E - MEX and Increments |
34B - Sale | 1436A - Reorder |
1363C - Game On Leaves | 1373C - Pluses and Minuses |