package main

import . "fmt"
import . "slices"

func main() {
	var a string
	Scan(&a)
	b := []byte(a)
	r := Clone(b)
	Reverse(r)
	b = append(b, r...)
	for i := 0; ; i++ {
		for j, ch := range r {
			if j+i < len(r) {
				continue
			}
			b[j+i] = ch
		}
		t := Clone(b[:i+len(r)])
		Reverse(t)
		if Equal(t, b[:i+len(r)]) {
			Println(string(t))
			return
		}
	} 
}