Replace a charecter by next charecter

#include<stdio.h>
int main()
{
        char ch;
        printf("\n Enter the charecter from the keyboard ");
        scanf("%c",&ch);
        if(ch>=97 && ch<=121)
        {
                ch++;
        }
        else if(ch=122)
        {
                ch='a';
        }
        printf("\n The output charecter is = %c \n",ch);
}