Nice Garland

版权声明：来自星空计算机团队(QQ群：134826825)——StarSky_STZG https://blog.csdn.net/weixin_43272781/article/details/86619803

https://codeforces.com/contest/1108/problem/C

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG
#define RI register int
using namespace std;
typedef long long ll;
//typedef __int128 lll;
const int N=200000+10;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,q;
int ans,cnt,flag,temp;
int a[N];
char str[N];
char ansstr[N];
char tmpstr[N];
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    scanf("%d",&n);
    scanf("%s",str);
    //while(t--){}
    char s[6][4]={"RGB","RBG","BGR","BRG","GBR","GRB"};
    ans=INF;
    for(int i=0;i<6;i++){
        cnt=0;
        for(int j=0;j<n;j++){
            tmpstr[j]=s[i][j%3];
            if(tmpstr[j]!=str[j])
                cnt++;
        }
        if(cnt<ans){
            tmpstr[n]='\0';
            ans=cnt;
            strcpy(ansstr,tmpstr);
        }
    }
    cout << ans << endl;
    cout << ansstr << endl;
    //cout << "Hello world!" << endl;
    return 0;
}