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#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>
int main( int argc, char *argv[] )
{
_setmode( _fileno( stdin ), _O_BINARY );
_setmode( _fileno( stdout ), _O_BINARY );
int l0, l1, r0, r1;
const double HZ = 0.2;
const double RATE = 44100.0;
const double PI2 = 3.141592653589793238462643383279 * 2.0;
unsigned long indx = 0;
while( (l0 = getchar()) != EOF &&
(l1 = getchar()) != EOF &&
(r0 = getchar()) != EOF &&
(r1 = getchar()) != EOF ){
short l = (short)(l0 << 8 | (0xff & l1));
short r = (short)(r0 << 8 | (0xff & r1));
double vl = l / 32768.0;
double vr = r / 32768.0;
double t = indx / RATE;
double amp = 1.0 * sin( t * HZ * PI2 );
vl *= amp;
vr *= amp;
short sv = (short)(vl * 32768.0);
unsigned char b0 = (unsigned char)(0xff & (sv >> 8));
unsigned char b1 = (unsigned char)(0xff & sv);
putchar( b0 );
putchar( b1 );
sv = (short)(vr * 32768.0);
b0 = (unsigned char)(0xff & (sv >> 8));
b1 = (unsigned char)(0xff & sv);
putchar( b0 );
putchar( b1 );
indx++;
}
}
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