func_code_string: #include <bits/stdc++.h>   using namespace std;       typedef long double ld;   const long long inf = 1100000000000000000;   #define maxn 200050   #define mod 1000000007 //998244353    #define int long long    #define PB push_back   #define F first   #define S second   #define vi vector<int>   #define rep(i,a,b)  for( int i = a; i < b; i++ )   #define rep1(i,a,b) for( int i = a; i <= b; i++)   #define repd(i,a,b) for( int i = a; i >= b; --i)   #define sz(x) (int)((x).size())     #define all(c) (c).begin(),(c).end()   #define allr(v) v.rbegin(),v.rend()   #define mem(a,x) memset(a,x,sizeof(a))   #define dbg(a) cout << #a <<   is   << (a); cout <<   n ;   template <class T> void PR(T a[], int n, int x = 0) { for ( int i = x; i < n; i++ ) cout << a[i] <<    ; cout<<   n  ; }   template <class T> void PR(vector <T> v) { for ( T i : v ) cout << i <<     ; cout <<   n ; }   template <class T> void PR(set <T> s) { for ( T i : s ) cout << i <<     ; cout <<   n ; }   template <class T> void PR(multiset <T> s) { for ( T i : s ) cout << i <<     ; cout <<   n  ; }   const long double PI=3.141592653589793238462643383279502884197169399375105820974944;   //...   void solve(){    int n, k; cin>>n>>k;    string s =   ;    rep(i, 0, k){     rep(j, i, k){      s += (j+ a );      if(j != k-1)       s += (i+ a );     }    }    int m = sz(s);    rep(i, 0, n)     cout<<s[i%m];   }      signed main(){       ios_base::sync_with_stdio(false), cin.tie(nullptr);    int T=1;// cin>>T;        while(T--){           solve();cout<<  n ;       }       return 0;   }