import std.stdio, std.string, std.conv, std.algorithm, std.numeric;
import std.range, std.array, std.math, std.typecons, std.container, core.bitop;


void main() {
    string a;
    scan(a);

    int[] cnt = new int[](26);
    foreach (ai ; a) {
        cnt[ai - 'a']++;
    }

    long ans = 1L * a.length * (a.length + 1) / 2 - a.length + 1;

    foreach (i ; 0 .. 26) {
        ans -= 1L * cnt[i] * (cnt[i] - 1) / 2;
    }

    writeln(ans);
}



void scan(T...)(ref T args) {
    string[] line = readln.split;
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}



void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}