import java.util.*;
class Main{
public static void main
(String[]args
){ Scanner cin
=new Scanner
(System.
in); for(;cin.hasNext();){
line=cin.nextLine();
while (true) {
boolean a = true;
for (int b = 0; b < line.length() - 1;) {
int c
= Character.
getNumericValue(line.
charAt(b
)); int d
= Character.
getNumericValue(line.
charAt(b
+ 1)); if (c == d - 1 || c == d + 1) {
line = line.substring(0, c) + line.substring(d + 1, line.length());
a = false;
} else {
b++;
}
}
if (a) {
break;
}
}
}
}
}
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