Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Shares in Carillion, the UK's second-biggest construction firm, fell 48% on Friday after it issued its third profit warning since July and said it expected to breach its loan conditions.

HS2 contractor Carillion's shares hit by profit alert