School algebra
Trinomial ax + by + c of two variables x and y are uniquely determined by the constant term c and the coefficients a and b. Write a program that, given a, b and c displays the corresponding trinomial recorded using algebraic arrangements:
coefficient of the term containing the variable is omitted if it is equal to one unit;
term, the coefficient which is equal to zero, is omitted;
"+" sign is omitted if it is preceded by a negative coefficient;
"+" sign is omitted if it is at the beginning of (the so-called unary plus);
multiplication sign between the coefficient and the variable is omitted.
At the same time it is not allowed to swap terms.
Input
The input file contains three integers a, b and c (-9 ≤ a, b, c ≤ 9).
Output
Print a string containing the trinomial, written according to these rules.