import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
class Solution {
public static void main
(String[] args
) { Scanner in
= new Scanner
(System.
in); int start = in.nextInt();
int end = in.nextInt();
for (int i = start; i < end; ++i) {
System.
out.
print(S.
charAt(i
)); }
}
}
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