#include <iostream>
#include <math.h>
#define PI 3.14159265
using namespace std;
int main()
{
double c;
while (1)
{
for(double a = -PI; a< PI; a+=0.35)
{
c = sin (a)*10;
if (c>0)cout <<" ";
else c+=10;
for (int b=0; c>b; b++)cout << " ";
cout<<"waves\n";
}
}
}