#include <stdio.h>
int main(int argc, char *argv[])
{
char str[100];
int i;
fscanf(stdin
, "%99[^\n]c", str
); for (i = 0; i < sizeof(str); ++i)
{
switch (str[i])
{
case 'a':
case 'A':
case 'b':
case 'B':
str[i] = '?';
break;
default:
break;
}
}
return 0;
}
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