diff --git a/src/main/java/com/bytelegend/Challenge.java b/src/main/java/com/bytelegend/Challenge.java
index 5d40ff9..19a08fe 100644
--- a/src/main/java/com/bytelegend/Challenge.java
+++ b/src/main/java/com/bytelegend/Challenge.java
@@ -1,7 +1,5 @@
 package com.bytelegend;
 
-import java.util.Arrays;
-
 public class Challenge {
     /**
      * Given an array containing any objects `Object[]`, convert it to `int[]` array. The objects
@@ -22,13 +20,21 @@ public static int[] convert(Object[] objects) {
                 ret[i] = ((Number) o).intValue();
             }
             if (o instanceof CharSequence) {
-                int intnum = 0;
+                int val = 0;
                 CharSequence charSequence = (CharSequence) o;
+                boolean minus = false;
                 for (int j = 0; j < charSequence.length(); j++) {
+                    if(charSequence.charAt(j) == '-'){
+                        minus = true;
+                        continue;
+                    }
                     int d = charSequence.charAt(j) - '0';
-                    intnum = intnum * 10 + d;
+                    val = val * 10 + d;
+                }
+                if(minus) {
+                    val *= -1;
                 }
-                ret[i] = intnum;
+                ret[i] = val;
             }
         }
         return ret;