String digits$\_$string is read from input. If $\text{'}55\text{'}$ is in digits$\_$string, then:

Output $\text{'}$At position: $\text{'}$ followed by the index of the last occurrence.

Create a string from digits$\_$string with the first three occurrences of $\text{'}55\text{'}$ replaced by $\text{'}5\text{'}$ and output digits$\_$string on a newline.

Otherwise, output $\text{'}$No matches'