#include <stdio.h>
int main() {
    int x; //输入距离
    scanf("%d",&x);
    //float t1 = x/1.0;
    //float t2 = x/10.0+10;
   // if (t1<t2) 
      if(x<12){//结合题意，数学运算
      printf("w");
    } else{
        printf("v");
    }
    return 0;
}