Main.cc: In function 'int main()':
Main.cc:27:17: error: expected primary-expression before '<' token
if('A'>=a && a=<'Z'){
^
Main.cc:29:23: error: expected primary-expression before '<' token
}else if('a'>=a && a=<'z'){
^
Main.cc:31:23: error: expected primary-expression before '<' token
}else if('9'>=a && a=<'1'){
^