diff --git a/POD/Week2-Strings/day1.py b/POD/Week2-Strings/day1.py
new file mode 100644
index 0000000..f04debe
--- /dev/null
+++ b/POD/Week2-Strings/day1.py
@@ -0,0 +1,15 @@
+class Solution:
+    def isIsomorphic(self, s: str, t: str) -> bool:
+        d = dict()  #dictionary to allot characters of s as keys and characters of t as values
+        flag = True
+        l = len(t)
+        for i in range(l):
+            if s[i] not in d.keys():   #checking if the character of s has already been allotted to a character of t
+                if t[i] in d.values(): #checking if character of t has been allotted to different character of s
+                    flag = False
+                    break
+                d[s[i]] = t[i]     #alloting a character of s to character of t
+            elif d[s[i]] != t[i]:  #checking if character of t is not equal to previously allotted character in dictionary
+                flag = False
+                break
+        return flag