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diff --git a/challenge-255/nelo-tovar/bash/ch-1.sh b/challenge-255/nelo-tovar/bash/ch-1.sh
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+#!/usr/bin/env bash 
+#
+# The Weekly Challenge 255 - By Nelo Tovar
+#
+# https://theweeklychallenge.org/blog/perl-weekly-challenge-255/
+#
+# Task 1 : Odd Character
+
+function odd_character() {
+    local s=$1
+    local t=$2
+    declare -A frequency=()
+
+    for (( i = 0; i < ${#t}; i++ )); do
+        letter=${t:$i:1}
+        ((frequency[$letter]++))
+    done
+
+    for (( i = 0; i < ${#s}; i++ )); do
+        letter=${s:$i:1}
+        ((frequency[$letter]--))
+    done
+
+    for key in "${!frequency[@]}"; do
+        if [ ${frequency[$key]} -gt 0 ]; then
+            echo $key
+            return
+        fi
+    done
+
+    echo ' '
+}
+
+
+declare -A examples=([Perl]=Preel [Weekly]=Weealy [Box]=Boxy)
+
+for key in "${!examples[@]}"; do
+    s=$key
+    t=${examples[$key]}
+    oc=$(odd_character $s $t)
+    echo "Input  : s = $s t = $t"
+    echo "Output : $oc"
+    echo ""
+done
+