import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String args[] ) throws Exception {
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
String str;
Scanner scn=new Scanner(System.in);
str=scn.next();
int[] values=new int[str.length()];
for(int i=0;i<str.length();i++)
{
values[i]=(int)(str.charAt(i));
}
int min=values[0];
for(int i=0;i<values.length;i++)
{
if(values[i]<=min)
min=values[i];
}
char c=(char)min;
System.out.print(c);
}
}
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
public class Solution {
public static void main(String args[] ) throws Exception {
/* Enter your code here. Read input from STDIN. Print output to STDOUT */
String str;
Scanner scn=new Scanner(System.in);
str=scn.next();
int[] values=new int[str.length()];
for(int i=0;i<str.length();i++)
{
values[i]=(int)(str.charAt(i));
}
int min=values[0];
for(int i=0;i<values.length;i++)
{
if(values[i]<=min)
min=values[i];
}
char c=(char)min;
System.out.print(c);
}
}
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