#include<stdio.h>#include<iostream>#include<memory.h>#include<math.h>using namespace std;int flag1[5000];int flag2[5000];int flag3[5000];int main(){    memset(flag1,0,sizeof(flag1));    memset(flag2,0,sizeof(flag2));    memset(flag3,0,sizeof(flag3));    int n;    cin>>n;    int kiss,kiss1=0,kiss2=0,kiss3=0;    int minn=1000000;    for(int i=0;i<n;i++)    {        cin>>kiss;        if(kiss==1)            flag1[++kiss1]=i;        else if(kiss==2)            flag2[++kiss2]=i;        else            flag3[++kiss3]=i;    }    minn=min(kiss1,min(kiss2,kiss3));    cout<<minn<<endl;    for(int i=0;i<minn;i++)    {        cout<<flag1[i+1]+1<<" "<<flag2[i+1]+1<<" "<<flag3[i+1]+1<<endl;    }    return 0;}