Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<strlen(a);i++){
~^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<strlen(a);i++){
~^~~~~~~~~~
