#include <stdio.h>
 
int countIntersections(char s[]) {
    int intersections = 0;
 
    // Duyệt qua mỗi kí tự trong xâu
    for (int i = 0; i < 52; i += 2) {
        // Duyệt qua các kí tự còn lại
        for (int j = i + 2; j < 52; j += 2) {
            // Kiểm tra xem các đoạn thẳng có cắt nhau không
            if (s[i] == s[j] || s[i] == s[j + 1] || s[i + 1] == s[j] || s[i + 1] == s[j + 1]) {
                intersections++;
            }
        }
    }
 
    return intersections;
}
 
int main() {
    char s[53];
    scanf("%s", s);
 
    int result = countIntersections(s);
 
    printf("%d\n", result);
 
    return 0;
}
 

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

QUJDQ0JBRERFRUZGR0dISElJSkpLS0xMTU1OTk9PUFBRUVJSU1NUVFVVVlZXV1hYWVlaWg==

ABCCBADDEEFFGGHHIIJJKKLLMMNNOOPPQQRRSSTTUUVVWWXXYYZZ