diff --git a/10215501451.md b/10215501451.md
new file mode 100644
index 0000000..104f684
--- /dev/null
+++ b/10215501451.md
@@ -0,0 +1,21 @@
+touch text1.txt
+
+for i in `seq 50000`;do echo $RANDOM | md5sum | cut -c 1-9 ;done >> text1.txt
+
+export LC_ALL=C
+
+sort text1.txt  | uniq
+
+sort -n text1.txt | uniq
+
+sort text1.txt  | uniq > letter.txt
+
+sort -n text1.txt | uniq >> number.txt
+
+
+
+echo -e "computer\ndata\nscience\nengineering\nscience\nengineeringc\ncomputer\ncomputer\necnu\ndata" > text2.txt
+
+grep computer text2.txt
+
+grep -c computer text2.txt
\ No newline at end of file