run c program with cgdb and blocked at getchar()

My test.c file:

 #include<stdio.h> 
 int main() {
     int myChar;
     myChar = getchar();
     printf("You entered:  %c\n", myChar);
     return 0;
 }

compiled and run with cgdb:

$ gcc -g test.c
$ cgdb a.out

I input start, then input n, and I want to pass character 'A' to getchar().

cgdb shows:

    (gdb) start
    Temporary breakpoint 1 at [34m0x1169[m: file [32mtest.c[m, line 3.
    Starting program: /home/test/code/a.out 

    Temporary breakpoint 1, [33mmain[m () at [32mtest.c[m:3
    3       int main(){

    (gdb) n
    6         myChar = getchar();
    (gdb) n
    A

I got blocked at the getchar() when I use cgdb. I input 'A' and Enter, but it didn't continue. I don't have this problem with gdb.