import java.lang.Math
import kotlin.comparisons.*

val MOD: Int = 1000000000 + 7
val MODL: Long = MOD.toLong()

fun main(args: Array<String>)
{
    val c = read().toCharArray()
    val ans = c[0] + 1
    println(ans)
}

fun read(): String = readLine()!!
fun CharSequence.split(): List<String> = this.split(" ")
fun Iterable<String>.toInt(): List<Int> = this.map{it.toInt()}
fun Iterable<String>.toLong(): List<Long> = this.map{it.toLong()}
