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------------------
import java.util.Scanner;
public class plusminus {
public static void main(String[] args) {
Scanner in = new Scanner(
System.in
);
String s1 = in.nextLine();
String s2 = in.nextLine();
int ka = in.nextInt();
if (s1.length()<=1000&&s2.length()<=1000&&s1.isBlank()==false&&s2.isBlank()==false&&ka>0) {
for (int i = 0; i+1 <= s1.length()||i+1 <= s2.length(); i=i+ka )
{//s1À̳ª s2ÀÇ ±æÀÌ°¡ µ¿³¯¶§±îÁö
if (s1.length()<=i+ka)
{//s1±æÀÌ°¡ °£°Ý(¸¸¾à 4 ¶ó¸é) 3 ÀÌÇϳ²¾ÒÀ»¶§
System.out.print(s1.substring(i));
System.out.print(s2.substring(i));
return;
} else if (s2.length()<=i+ka)
{//À§ÀÇ °æ¿ì¿¡¼ s1°¡ s2·Î¸¸ ¹Ù²î¾úÀ»¶§
System.out.print(s1.substring(i, i+ka));
System.out.print(s2.substring(i));
System.out.print(s1.substring(i+ka));
return;
} else {
System.out.print(s1.substring(i, i+ka));
System.out.print(s2.substring(i, i+ka));
}
}
}
in.close();
}
}
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