#include 
     
      #include 
      
       using namespace std;struct num{    double a;    double b;};void add(struct num A, struct num B, struct num* C);void sub(struct num A, struct num B, struct num* C);void mul(struct num A, struct num B, struct num* C);void div(struct num A, struct num B, struct num* C);void clac(char op, struct num A, struct num B, struct num* C);void clac(char op, struct num A, struct num B, struct num* C){    switch(op){        case '+': add(A,B,C); break;        case '-': sub(A,B,C); break;        case '*': mul(A,B,C); break;        case '/': div(A,B,C); break;    }}void add(struct num A, struct num B, struct num* C){    C->a = A.a + B.a;    C->b = A.b + B.b;}void sub(struct num A, struct num B, struct num* C){    C->a = A.a - B.a;    C->b = A.b - B.b;}void mul(struct num A, struct num B, struct num* C){    C->a = A.a*B.a - A.b*B.b;    C->b = A.a*B.b + A.b*B.a;}void div(struct num A, struct num B, struct num* C){    double x = B.a*B.a + B.b*B.b;    C->a = (A.a*B.a + A.b*B.b)/x;    C->b = (A.b*B.a - A.a*B.b)/x;}int main(){    struct num A;    struct num B;    struct num C;    char op;    cin >> op >> A.a >> A.b >> B.a >> B.b;    clac(op, A,B,&C);    printf("%.2f+%.2fi\n", C.a, C.b);    return 0;}