import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }




void main() {
  try {
    for (; ; ) {
      const A = readLong();
      const B = readLong();
      const C = readLong();
      const a = cast(real)(A);
      const b = cast(real)(B);
      const c = cast(real)(C);
      
      if (A != 0) {
        const D = B * B - 4 * A * C;
        if (D > 0) {
          const d = sqrt(cast(real)(D));
          real[] ts;
          ts ~= (-b + d) / (2.0L * a);
          ts ~= (-b - d) / (2.0L * a);
          ts.sort;
          writeln(2);
          writefln("%.15f", ts[0]);
          writefln("%.15f", ts[1]);
        } else if (D == 0) {
          writeln(1);
          writefln("%.15f", -b / (2.0L * a));
        } else {
          writeln(0);
        }
      } else if (B != 0) {
        writeln(1);
        writefln("%.15f", -c / b);
      } else if (C != 0) {
        writeln(0);
      } else {
        writeln(-1);
      }
    }
  } catch (EOFException e) {
  }
}