Smallest character in String as per alphabet and ASCII sequence using java

	import java.util.Scanner;
	public class Main {
	public static void main(String[] args) {
	// write your code here
	Scanner sc = new Scanner(System.in);
	String str=sc.next();
	int size=str.length();
	// System.out.println(size);
	char smallestChar=minimumCharValue (str,size);
	System.out.println(smallestChar);
	}
	private static char minimumCharValue(String str,int size) {
	/*
	* Letter ASCII Code
	* A 65
	* Z 90
	* a 97
	* z 122
	* */
	char min='z';//Previous i put capital Z
	for(int i=0;i<size-1;i++)
	{
	if(str.charAt(i)<min)
	min=str.charAt(i);
	}
	return min;
	}
	}