import java.util.Scanner

fun main() {
	val scn = Scanner(System.`in`)
	val k = scn.nextInt()
	val s = scn.next()
	val l = s.length
	val f = mutableListOf(ModInt(1))
	for (i in 1..l+k){
		f.add(f.last()*i)
	}
	val bef = Array(k+1){ModInt.pow(25, it)*f[l-1+it]/(f[it]*f[l-1])}
	val arr = mutableListOf(ModInt(1))
	for (c in 1..k){
		arr.add(arr.last()*26+bef[c])
	}
	println(arr.last())
}

class ModInt {
	var v: Long
		private set
	constructor(v: Int){
		this.v = when {
			v>=0 -> v.toLong() % MOD
			v==Int.MIN_VALUE -> 852516373
			else -> MOD.toLong() - (-v%MOD)
		}
	}
	constructor(v: Long){
		this.v = when {
			v>=0 -> v % MOD
			v==Long.MIN_VALUE -> 708828003
			else -> MOD - (-v%MOD)
		}
	}

	override fun toString() = v.toString()
	fun toInt() = v.toInt()
	fun toLong() = v
	override fun equals(other: Any?): Boolean {
		return if (other is ModInt) v == other.v else false
	}
	override fun hashCode() = 31*17 + v.hashCode()

	operator fun unaryPlus() = this
	operator fun unaryMinus() = ModInt(MOD-this.v)

	private operator fun plus(o: Long) = ModInt(this.v + o)
	operator fun plus(o: ModInt) = this.plus(o.v)
	operator fun plus(o: Int) = this.plus(o.toLong())
	private operator fun minus(o: Long) = this.plus(-o)
	operator fun minus(o: ModInt) = this.minus(o.v)
	operator fun minus(o: Int) = this.minus(o.toLong())
	private operator fun times(o: Long) = ModInt(this.v*o)
	operator fun times(o: ModInt) = this.times(o.v)
	operator fun times(o: Int) = this.times(o.toLong())
	private operator fun div(o: Long) = this.times(pow(o, MOD-2))
	operator fun div(o: ModInt) = this.div(o.v)
	operator fun div(o: Int) = this.div(o.toLong())

	operator fun inc() = this.plus(1)
	operator fun dec() = this.minus(1)

	companion object{
		const val MOD = 1000000007

		private fun pow(b:Long, e: Int): ModInt{
			if (b==1L) return ModInt(1)
			var ans = 1L
			var b = b; var e = e
			while (e!=0){
				if (e%2==1) ans = (ans*b)%MOD
				b = (b*b)%MOD
				e /= 2
			}
			return ModInt(ans)
		}
		fun pow(b: Int, e: Int): ModInt = pow(b.toLong(), e)
		fun pow(b: ModInt, e: Int): ModInt = pow(b.v, e)
	}
}
