A+B+C+D+E+F+G+H+I+J+K+L+M+N+O+P+Q+R+S+T+U+V+W+X+Y+Z=?
Your answer could possibly be 351 given that each letter may correspend to a number from 1-26 as shown:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26=351
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Other that that, your question is very hard to answer due to the lack of prior knowledge.