Alice encrypts the messages M$1$ and M$2$ with the same one$-$time pad using only capital letters and spaces, as in Section $4\mathrm{.}3.$ Eve knows this, intercepts the ciphertexts C$1$ and C$2,$ and also learns that the decryption of M$1$ is THE LETTER $*$ ON THE MAP GIVES THE LOCATIONOFTHETREASURE. Unfortunately for Eve, she cannot read the missing letter $*.$ However, the $12$th group of seven bits in C$1$ is $1001101$ and the $12$th group in C$2$ is $0110101.$

Find the missing letter?