diff --git a/captcha/captcha.sh b/captcha/captcha.sh
index 8b7be4b..c41b134 100755
--- a/captcha/captcha.sh
+++ b/captcha/captcha.sh
@@ -54,7 +54,7 @@ INTRUS()
     SORTED_UNIQ_NUM=$(echo "${NUMBERS[@]}" | sort -u | tr '\n' ' ')
     INTRUS=-1
     
-    for i in 0 1 2 3 4 5 6 7 8 9
+    for i in 1 2 3 4 5 6 7 8 9
     do
         if [[ ! " ${SORTED_UNIQ_NUM[@]} " =~ " ${i} " ]]; then
             INTRUS=$i
diff --git a/captcha/experimental.sh b/captcha/experimental.sh
index 8b7be4b..c41b134 100755
--- a/captcha/experimental.sh
+++ b/captcha/experimental.sh
@@ -54,7 +54,7 @@ INTRUS()
     SORTED_UNIQ_NUM=$(echo "${NUMBERS[@]}" | sort -u | tr '\n' ' ')
     INTRUS=-1
     
-    for i in 0 1 2 3 4 5 6 7 8 9
+    for i in 1 2 3 4 5 6 7 8 9
     do
         if [[ ! " ${SORTED_UNIQ_NUM[@]} " =~ " ${i} " ]]; then
             INTRUS=$i