largest number
import java.util.Scanner;
class Main{
public static void main(String [] args){
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int largest=0;//int digit=1;
while(n>0){
int digit=n%10;
if(digit>largest){
largest=digit;
}
n=n/10;
}
System.out.println(+largest);
}
}
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