Main.cc:9:1: error: expected unqualified-id before 'for'
for(char a='Z';a>='A';a--){
^
Main.cc:9:16: error: 'a' does not name a type
for(char a='Z';a>='A';a--){
^
Main.cc:9:23: error: 'a' does not name a type
for(char a='Z';a>='A';a--){
^