/* package whatever; */
import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
String s
= "ABCDEmasterbbbbbbb123"; int j = -1;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
c += j;
j = -j;
}
}
}
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