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#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define ROF(i, a, b) for (int i = (a); i >= (b); --i)
#define all(x) x.begin(),x.end()
#define CLR(i,a) memset(i,a,sizeof(i))
#define fi first
#define se second
#define pb push_back
#define SZ(a) ((int) a.size())
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef __int128 i128;
typedef pair<ll,ll> pll;
typedef array<ll,3> arr;
typedef double DB;
typedef pair<DB,DB> pdd;
typedef pair<ll,bool> plb;
constexpr ll MAXN=static_cast<ll>(1e2)+10,INF=static_cast<ll>(5e18)+3;
ll N,M,T;
ll cnt[28];
char ingre[4]={'L','I','T'};
inline bool cmp(const char &a,const char &b){
return cnt[a-'A']<cnt[b-'A'];
}
inline void solve(){
cin>>N;
vector<char> s;
for(int i=0;i<=26;++i){
cnt[i]=0;
}
FOR(i,1,N){
char a;
cin>>a;
s.pb(a);
++cnt[a-'A'];
}
bool canOper=false;
for(int i=0;i<(int)s.size()-1;++i){
if(s[i]!=s[i+1]){
canOper=true;
}
}
if(!canOper){
cout<<-1<<"\n";
return;
}
bool haveAns=false;
vector<ll> ans;
for(int i=1;i<=2*N+1;++i){
if(cnt['L'-'A']==cnt['I'-'A'] && cnt['L'-'A']==cnt['T'-'A']){
haveAns=true;
break;
}
bool hasOp=false;
sort(ingre,ingre+3,cmp);
for(int i=0;i<3;++i){
char obj=ingre[i];
for(int i=0;i<(int)s.size()-1;++i){
if(s[i]!=s[i+1]){
if(s[i]!=obj && s[i+1]!=obj){
s.insert(s.begin()+i+1,obj);
ans.pb(i);
++cnt[obj-'A'];
hasOp=true;
}
if(hasOp){
break;
}
}
}
if(hasOp){
break;
}
}
}
#ifdef LOCAL
for(int i=0;i<s.size();++i){
cerr<<s[i];
}
cerr<<"\n";
cerr<<"T:"<<cnt['T'-'A']<<"\n";
cerr<<"I:"<<cnt['I'-'A']<<"\n";
cerr<<"L:"<<cnt['L'-'A']<<"\n";
#endif
if(haveAns){
cout<<ans.size()<<'\n';
for(int i=0;i<ans.size();++i){
cout<<ans[i]+1<<"\n";
}
}else{
cout<<-1<<"\n";
}
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
cin>>T;
while(T--){
solve();
}
return 0;
}
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