#include "stdio.h"
#include "math.h"
int main()
{
float x;
for(;scanf("%f",&x)!=EOF;)
printf("%.2f\n",fabs(x));
}
#include "stdio.h"
#include "math.h"
int main()
{
float x;
for(;scanf("%f",&x)!=EOF;)
printf("%.2f\n",fabs(x));
}