//Shortcuts

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
#define pb push_back
#define fi first
#define se second
#define endl "\n"
#define all(x) x.begin(),x.end()
template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

//Macros
#ifndef ONLINE_JUDGE
#include "debug.h"
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif

//IO functions

void inp(vi& a)
{
    for(int i = 0; i < a.size(); i++)
        cin >> a[i];
}

void inp(vll& a)
{
    for(int i = 0; i < a.size(); i++)
        cin >> a[i];
}

ostream& operator << (ostream& s, pi& a)
{
    return s << a.fi << " " << a.se;
}

ostream& operator << (ostream& s, pll& a)
{
    return s << a.fi << " " << a.se;
}

ostream& operator << (ostream& s, vi& a)
{
    for(int i : a)
        s << i << " ";
    return s;
}

ostream& operator << (ostream& s, vll& a)
{
    for(ll i : a)
        s << i << " ";
    return s;
}

void yes(bool b)
{
    if(b)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
}

//EXTRA FUNCTIONS*******************************************************
int convert(char c)
{
    if(c <= '9')
        return c - '0';
    if(c <= 'Z')
        return c - 'A' + 10;
    return c - 'a' + 36;
}
//END OF EXTRA FUNCTIONS************************************************

//Write code here

void run(int test)
{
    string s; cin >> s; int n = s.length();
    vector<vector<vector<ll>>> dp(2, vector<vector<ll>>(62, vector<ll>(62, 0)));
    vector<ll> cnt(62, 0);
    vector<ll> pre(62, 0);
    for(int i = 0; i < n; i++)
        pre[convert(s[i])]++;

    const int MOD = 998244353;
    ll ans = 0;
    for(int i = n-1; i >= 0; i--)
    {
        int c = convert(s[i]);
        pre[c]--;
        for(int k = 0; k < 62; k++)
        {
            if(k != c)
            {
                ll ch = (i-(pre[k]+pre[c]));
                ll ways = ch * (ch-1) / 2;
                ways %= MOD;
                ll ways2 = dp[1][k][c];
                ans += (ways*ways2)%MOD;
                ans %= MOD;
            }
        }
        for(int j = 1; j >= 0; j--)
        {
            if(j == 0)
            {
                for(int k = 0; k < 62; k++)
                {
                    dp[j][c][k] += cnt[k];
                    dp[j][c][k] %= MOD;
                }
            }
            else
            {
                for(int k = 0; k < 62; k++)
                {
                    dp[j][c][k] += dp[j-1][k][c];
                    dp[j][c][k] %= MOD;
                }
            }
        }
        cnt[c]++;
    }
    cout << ans << endl;
}

//Main function

int32_t main()
{
    //Fast IO
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    //cin >> t;
    for(int i = 1; i <= t; i++)
        run(i);
    return 0;
}