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

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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;
}
}

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