#include <stdio.h>
int main (int argc, char *argv[]) {
char input[100], output[100];
int length;
length = sizeof(input)/sizeof(input[0]);
for (int i = 0; input[i] != '\0'; i++) {
if (input[i] >= 97 && input[i] <= 122) {
output[i] = input[i] - 32;
} else if (input[i] >= 65 && input[i] <= 90) {
output[i] = input[i] + 32;
}
}
return 0;
}
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