#include<bits/stdc++.h>
#define fi first
#define se second
#define pb push_back
#define ll long long
#define ii pair <int,int>
#define pl pair <ll,ll>
#define fr(i,x,y) for (int i=x;i<=y;i++)
#define ft(i,x,y) for (int i=y;i>=x;i--)
#define N 100005
using namespace std ;
int res,n,color[1002][1002],first_color[1002][1002],dem_mau[N][3];
string s;
void inp()
{
// freopen("task2.inp","r",stdin) ;
// freopen("task2.out","w",stdout);
cin>>n>>s;
}
bool hs(int u,int v)
{
if (u>v) swap(u,v);
if (u==1 and v==n) return true ;
return false;
}
int tong_mau(int st,int ed,int j){
if (ed!=n and st!=1)
return dem_mau[n][j] - (dem_mau[n][j]-dem_mau[ed-1][j])-(dem_mau[st-1][j]);
else return dem_mau[n][j] - (dem_mau[n][j]-dem_mau[ed][j])-(dem_mau[st-1][j]);
}
bool checking_chanle(int a,int b,int c){
// cout<<a<<" "<<b<<" "<<c<<endl;
a = max(a,0);
b = max(b,0);
c = max(c,0);
int tong = a+b+c ;
int r = tong%2;
if((a==0 and b==0) or (a==0 and c==0) or (b==0 and c==0)) return false ;
if (a%2!=r or b%2!=r or c%2!=r) return false ;
return true ;
}
bool ad = true ;
void duyet(int st,int ed)
{
if (st>ed) swap(st,ed);
if (ed-st==2)
{
//cout<<res<<endl;
if (res==n-3)
{
cout<<"DA"<<"\n";
fr(i,1,n)
{
fr(j,i+2,n)
{
if (color[i][j]!=0)
{
if (hs(i,j)) continue ;
cout<<i<<" "<<j<<" "<<color[i][j]<<"\n";
}
}
}
exit(0);
}
return ;
}
fr(i,st+1,ed-1)
{
fr(now_color,1,3)
{
if (now_color!=color[st][ed])
{
int dem_ed_phai[4],dem_ed_trai[4],dem_st_phai[4],dem_st_trai[4];
fr(j,1,3){
dem_ed_trai[j] = dem_mau[ed-1][j]-dem_mau[i-1][j];
dem_ed_phai[j] = dem_mau[n][j] - dem_ed_trai[j] ;
dem_st_trai[j] = dem_mau[i-1][j]-dem_mau[st-1][j] ;
dem_st_phai[j] = dem_mau[n][j] - dem_st_trai[j];
}
//cout<<st<<" "<<ed<<" "<<tong_mau(st,ed,1)<<" "<<tong_mau(st,ed,2)<<" "<<tong_mau(st,ed,3)<<endl;
bool ok1 = true , ok2 = true ;
if (color[st][i]==0) {
color[st][i] = color[i][st] = 6 - now_color - color[st][ed];
dem_st_phai[color[st][i]]++;
dem_st_trai[color[st][i]]++;
ok1 = false ;
res++;
}
if (color[ed][i]==0){
color[ed][i] = color[i][ed] = now_color ;
dem_ed_phai[color[ed][i]]++;
dem_ed_trai[color[ed][i]]++;
ok2 = false ;
res++;
}
if (checking_chanle(dem_ed_phai[1],dem_ed_phai[2],dem_ed_phai[3]))
if (checking_chanle(dem_ed_trai[1],dem_ed_trai[2],dem_ed_trai[3]))
ok2 = true ;
if (checking_chanle(dem_st_phai[1],dem_st_phai[2],dem_st_phai[3]))
if (checking_chanle(dem_st_trai[1],dem_st_trai[2],dem_st_trai[3]))
ok1 = true ;
if (ok1 and ok2)
{
duyet(st,i);
duyet(ed,i);
return ;
}
color[i][st] = color[st][i] = first_color[st][i];
if (first_color[st][i]==0) res--;
color[i][ed] = color[ed][i] = first_color[ed][i];
if (first_color[ed][i]==0) res--;
}
}
}
}
void sub1()
{
fr(i,0,n-1)
{
if (i!=n-1)
{
color[i+1][i+2] = color[i+2][i+1] = s[i]-'0';
}
else color[1][n] = color[n][1] = s[i]-'0';
}
s=" "+s;
fr(i,1,n){
fr(j,1,3) dem_mau[i][j] = dem_mau[i-1][j];
dem_mau[i][s[i]-'0']++;
}
if (!checking_chanle(dem_mau[n][1],dem_mau[n][2],dem_mau[n][3])){
cout<<"NE";
exit(0);
}
fr(i,1,n)
fr(j,1,n)
first_color[i][j] = color[i][j];
duyet(n,1);
cout<<"NE";
}
int main()
{
inp();
sub1();
}
