Two character array, each length of more than 10000, it would be 100000
char s  and t 
for taking inputs, use scanf () or cin.
We r dealing with finding sub-sequences, which means we have to consider the character order.
For example, “sync” is not a subsequences of “sycn”
“VERDI” is a subsequences of “vivaVittorioEmanueleReDiItalia”