#include<bits/stdc++.h>
using namespace std;
#define int long long
const int PARCOULEURSMAXI=202,RED=0,GREEN=1,YELLOW=2,RIEN=3,INFINI=1000*1000;
int nbpots;
vector<int> couleurs;
vector<int> posR,posG,posY;
int memo[PARCOULEURSMAXI][PARCOULEURSMAXI][PARCOULEURSMAXI][4];
vector<int> devantR,devantG,devantY;
int dp(int nbR,int nbG,int nbY,int avant){
if (memo[nbR][nbG][nbY][avant]!=-1){
return memo[nbR][nbG][nbY][avant];
}
if (nbR+nbG+nbY==nbpots){
memo[nbR][nbG][nbY][avant]=0;
return 0;
}
int r=INFINI;
int c=INFINI;
if (nbR!=posR.size()){
c=min(c,posR[nbR]);
}
if (nbG!=posG.size()){
c=min(c,posG[nbG]);
}
if (nbY!=posY.size()){
c=min(c,posY[nbY]);
}
if (avant!=couleurs[c]){ // pas la meme couleur qu'avant
if (couleurs[c]==RED){
r=min(r,dp(nbR+1,nbG,nbY,RED));
}
else if (couleurs[c]==GREEN){
r=min(r,dp(nbR,nbG+1,nbY,GREEN));
}
else {
r=min(r,dp(nbR,nbG,nbY+1,YELLOW));
}
}
int mapos=nbR+nbG+nbY;
if (avant!=RED and couleurs[c]!=RED and nbR!=posR.size()){
int autrepos=max(devantR[posR[nbR]],nbR)+max(devantG[posR[nbR]],nbG)+max(devantY[posR[nbR]],nbY);
r=min(r,dp(nbR+1,nbG,nbY,RED)+autrepos-mapos);
}
if (avant!=GREEN and couleurs[c]!=GREEN and nbG!=posG.size()){
int autrepos=max(devantR[posG[nbG]],nbR)+max(devantG[posG[nbG]],nbG)+max(devantY[posG[nbG]],nbY);
r=min(r,dp(nbR,nbG+1,nbY,GREEN)+autrepos-mapos);
}
if (avant!=YELLOW and couleurs[c]!=YELLOW and nbY!=posY.size()){
int autrepos=max(devantR[posY[nbY]],nbR)+max(devantG[posY[nbY]],nbG)+max(devantY[posY[nbY]],nbY);
r=min(r,dp(nbR,nbG,nbY+1,YELLOW)+autrepos-mapos);
}
/*if (r!=0){
cout<<42<<endl;
}*/
memo[nbR][nbG][nbY][avant]=r;
//cout<<"RED "<<nbR<<" GREEN "<<nbG<<" YELLOW "<<nbY<<" avant "<<avant<<" rep "<<r<<endl;
return r;
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>nbpots;
for (int i=0;i<nbpots;i++){
char c;
cin>>c;
devantR.push_back(posR.size());
devantG.push_back(posG.size());
devantY.push_back(posY.size());
if (c=='R'){
couleurs.push_back(RED);
posR.push_back(i);
}
else if (c=='G'){
couleurs.push_back(GREEN);
posG.push_back(i);
}
else {
couleurs.push_back(YELLOW);
posY.push_back(i);
}
}
if (max(posR.size(),max(posG.size(),posY.size()))>(nbpots+1)/2){
cout<<-1<<endl;
return 0;
}
for (int i=0;i<=posR.size();i++){
for (int j=0;j<=posG.size();j++){
for (int k=0;k<=posY.size();k++){
for (int l=0;l<4;l++){
memo[i][j][k][l]=-1;
}
}
}
}
cout<<dp(0,0,0,RIEN)<<endl;
/*for (int i=0;i<=posR.size();i++){
for (int j=0;j<=posG.size();j++){
for (int k=0;k<=posY.size();k++){
for (int l=0;l<4;l++){
cout<<memo[i][j][k][l]<<" ";
}
cout<<endl;
}
}
}*/
return 0;
}
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