diff --git a/tri.py b/tri.py
new file mode 100644
index 0000000..289a714
--- /dev/null
+++ b/tri.py
@@ -0,0 +1,17 @@
+def function_tri(tableau):
+    for tab in tableau:
+        for i in range(1, len(tab)):
+            for i in range(1, len(tab)):
+                if tab[i] < tab[i-1]:
+                    a = tab[i]
+                    tab[i] = tab[i-1]
+                    tab[i-1] = a
+    for i in range (1, len(tableau)):
+        for i in range (1, len(tableau)):
+            if tableau[i][0] < tableau[i][0]:
+                a = tableau[i]
+                tableau[i] = tableau[i-1]
+                tableau[i-1] = a 
+    print(tableau)
+
+function_tri([[4,0,3], [5,3,2], [3,6,5]])
\ No newline at end of file