#include <bits/stdc++.h>
#include <unistd.h>
 
using namespace std;
 
typedef long long ll;
typedef pair<ll,ll> P;
 
long long int INF = 1e18;
const ll fact_table = 5000000;
double Pi = 3.1415926535897932384626;
 
vector<ll> G[550010];
vector<ll> R[550010];
vector<pair<ll, double> > tree[500010];
priority_queue <ll> pql;
priority_queue <P> pqp;
//big priority queue
priority_queue <ll,vector<ll>,greater<ll> > pqls;
priority_queue <P,vector<P>,greater<P> > pqps;
//small priority queue
//top pop
 
ll dx[8]={1,0,-1,0,1,1,-1,-1};
ll dy[8]={0,1,0,-1,1,-1,-1,1};
char dir[] = "DRUL";
//ll bit[500005];
//↓,→,↑,←
 
 
#define p(x) cout<<x<<"\n";
#define el cout<<"\n";
#define pe(x) cout<<(x)<<" ";
#define ps(x) cout<<fixed<<setprecision(25)<<x<<endl;
#define pu(x) cout<<(x);
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define CLEAR(a) a = decltype(a)(); 
 
 
ll mod = 998244353;
//ll mod = 1000000007;
 
ll rui(ll number1,ll number2){
 
    if(number2 == 0){
        return 1;
    }else{
        ll number3 = rui(number1,number2 / 2);
        number3 *= number3;
        number3 %= mod;
        if(number2%2==1){
            number3 *= number1;
            number3 %= mod;
        }
        return number3;
    }
}
ll gcd(ll number1,ll number2){
 
    if(number1 > number2){
        swap(number1,number2);
    }
    if(number1 == 0 || number1 == number2){
        return number2;
    }else{
        return gcd(number2 % number1,number1);
    }
}
void YES(bool condition){
 
    if(condition){
        p("YES");
    }else{
        p("NO");
    }
    return;
}
void Yes(bool condition){
 
    if(condition){
        p("Yes");
    }else{
        p("No");
    }
    return;
}
 
/*
ll fact[fact_table + 5],rfact[fact_table + 5];
 
void c3_init(){
    fact[0] = rfact[0] = 1;
    for(ll i=1; i<=fact_table; i++){
        fact[i] = (fact[i-1]*i) % mod;
    }
    rfact[fact_table] = rui(fact[fact_table],mod - 2);
    for(ll i=fact_table; i>=1; i--){
       rfact[i-1] = rfact[i] * i;
       rfact[i-1] %= mod;
    }
    return;}
ll c3(ll n,ll r){
    return (((fact[n] * rfact[r]) % mod ) * rfact[n-r]) % mod;}
*/
 
ll n,m,num,sum,a,b,c,d,e,f,g,h,w,i,j,q,r,l;
ll k,ans;
ll x[500005],y[500005],z[500005];
ll dp[1005][1005];
char s[500005];
bool used[500005];
ll v, p;

void painttate(ll a,ll b,ll c){
    dp[a][b] = dp[a+1][b] = c;
    return;
}

void paintyoko(ll a,ll b,ll c){
    dp[a][b] = dp[a][b+1] = c;
    return;
}

void paint3(ll a, ll b){
    dp[a][b] = 1;dp[a+1][b] = 1;
    dp[a+2][b] = 2;dp[a+2][b+1] = 2;
    dp[a][b+1] = 3;dp[a][b+2] = 3;
    dp[a+1][b+2] = 4;dp[a+2][b+2] = 4;
    return;
}

void paint4(ll a,ll b){
    dp[a][b] = 1;dp[a+1][b] = 1;
    dp[a][b+1] = 2;dp[a+1][b+1] = 2;
    dp[a][b+2] = 3;dp[a][b+3] = 3;
    dp[a+1][b+2] = 4;dp[a+1][b+3] = 4;
    dp[a+2][b] = dp[a+2][b+1] = 5;
    dp[a+3][b] = dp[a+3][b+1] = 6;
    dp[a+2][b+2] = dp[a+3][b+2] = 7;
    dp[a+2][b+3] = dp[a+3][b+3] = 8;
    return;
}

void paint5(ll a, ll b){
    paintyoko(a, b, 1);
    paintyoko(a, b + 2, 2);
    paintyoko(a+4, b+1, 3);
    paintyoko(a+4, b+3, 4);
    paintyoko(a+1, b+2, 5);
    painttate(a, b+4, 6);
    painttate(a+2, b+4, 7);
    painttate(a+1, b, 8);
    painttate(a+3, b, 9);
    painttate(a+2, b+1, 10);
    return;
}

void paint7(ll a,ll b){
    paint3(a, b);
    paint3(a + 3, b + 3);
    painttate(a, b + 6, 9);
    painttate(a+2, b+6, 10);
    painttate(a+4, b+6, 11);
    paintyoko(a+6, b, 12);
    paintyoko(a+6, b+2, 13);
    paintyoko(a+6, b+4, 14);
    return;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    cin >> n;
    if(n == 1 || n == 2){
        p(-1);
        return 0;
    }else if(n % 3 == 0){
        for(ll i=0;i<n/3;i++){
            paint3(i*3, i*3);
        }
    }else if(n % 4 == 0){
        for(ll i=0;i<n/4;i++){
            paint4(i*4, i*4);
        }
    }else if(n % 4 == 1){
        paint5(0, 0);
        for(ll i=0;i<(n - 5) / 4;i++){
            paint4(5 + i*4, 5 + i*4);
        }
    }else if(n % 4 == 2){
        paint5(0, 0);
        paint5(5, 5);
        for(ll i=0;i<(n - 10) / 4;i++){
            paint4(10 + i * 4, 10 + i * 4);
        }
    }else if(n % 4 == 3){
        paint7(0, 0);
        for(ll i=0;i<(n - 7) / 4;i++){
            paint4(7 + i * 4, 7 + i * 4);
        }
    }
    for(ll i=0;i<n;i++){
        for(ll j=0;j<n;j++){
            if(dp[i][j] == 0){
                pu(".");
            }else{
                char output = dp[i][j] + ('a' - 1);
                pu(output);
            }
        }
        el;
    }
   

    
    return 0;
}















Measured memory_bytes: 47616