String original$\_$substring is read from input. Then, sentence is read from input. If original$\_$substring is in sentence, then:

Output 'Found at index: $\text{'}$ followed by the index of the first occurrence.

Create a string from sentence with the first two occurrences of original$\_$substring replaced by $\text{'}$#$\text{'}$ and output sentence on a

newline.

Otherwise, output 'Not available'.

$>$ Click here for example

$1origina{l}_s$ubstring $=$ input$()$

$2$ sentence $=$ input$()$

$3,$String original$\_$substring is read from input. Then, sentence is read from input. If original$\_$substring is in sentence, then:String original$\_$substring is read from input. Then, sentence is read from input. If original$\_$substring is in sentence, then:

Output 'Found at index: $\text{'}$ followed by the index of the first occurrence.

Create a string from sentence with the first two occurrences of original$\_$substring replaced by $\text{'}$#$\text{'}$ and output sentence on a

newline.

Otherwise, output 'Not available'.

$>$ Click here for example

$1origina{l}_s$ubstring $=$ input$()$

$2$ sentence $=$ input$()$

$3,$

Output 'Found at index: $\text{'}$ followed by the index of the first occurrence.

Create a string from sentence with the first two occurrences of original$\_$substring replaced by $\text{'}$#$\text{'}$ and output sentence on a newline.