#include<stdio.h> int main() { double a,c,M; char b; while(scanf("%lf%c%lf",&a,&b,&c)!=EOF) { if(b==43||b==45||b==42||b==47) { switch(b) { case 43: M=a+c; printf("%.4lf+%.4lf=%.4lf\n",a,c,M); break; case 45: M=a-c; printf("%.4lf-%.4lf=%.4lf\n",a,c,M); break; case 42: M=a*c; printf(...