A bit-stuffing based framing protocol uses an 8-bit delimiter

A bit-stuffing based framing protocol uses an 8-bit delimiter pattern of 01111110. If the output bit-string after stuffing is 01111100101, then the input bit-string is

Output bit – string after stuffing : 0111110 ⇒ 0101 (Stuffed bit)
∴ Input string is 0111110101