find substring in string pyhton

Description

```python program to get a String and Substring and find where the substring is present in String.
Input:
entertainment
ain
Ouput:
6```

Solution

```s1=input("Enter a String:")
s2=input("Enter Substring:")
count=0
for i in range(0,len(s1)-len(s2)+1):
j=0
b=0
if(s1[i]==s2[j]):
k=i
while(j<len(s2)):
if(s1[k]!=s2[j]):
b=1
break
j=j+1
k=k+1
if(b==0):
print("The Sub string is at {}".format(i))
break
else:

```

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Explanation

`check whether first character of sub string is equal to any character in string. If it is equal, then check remaining characters are equal to the characters in substring.  else move to next character.`

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