/* package whatever; // don't place package name! */
import java.util.* ;
import java.lang.* ;
import java.io.* ;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main
( String [ ] args
) { Scanner s
= new Scanner
( System .
in ) ; int a= s.nextInt ( ) ;
for ( int i= 0 ; i< a; i++ )
{
b[ i] = s.next ( ) ;
input= input+ b[ i] ;
}
output= otp( input,a,b) ;
}
int o= 0 ;
for ( int i= 0 ; i< a; i++ )
{
char [ ] q= b[ i] .toCharArray ( ) ;
for ( int j= 0 ; j< q.length - 1 ; j++ )
{
on[ o] = "" ;
on[ o] = q[ j] + "" + q[ j+ 1 ] ;
++ o;
}
}
output= output+ on[ o- 1 ] ;
char [ ] in= input.toCharArray ( ) ;
int m= 0 ;
m= in[ 2 ] + in[ in.length - 1 ] ;
m= m- 48 - 48 ;
output= output+ m;
return output;
}
}
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