#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cjson/cJSON.h>

typedef struct {
    int customer_id;
    char name[100];
    char email[100];
} Customer;

int solution(Customer* customers, int n, Customer* result) {
    char seenEmails[1000][100];
    int seenCount = 0;
    int resultCount = 0;
    
    for (int i = 0; i < n; i++) {
        int found = 0;
        for (int j = 0; j < seenCount; j++) {
            if (strcmp(customers[i].email, seenEmails[j]) == 0) {
                found = 1;
                break;
            }
        }
        
        if (!found) {
            strcpy(seenEmails[seenCount], customers[i].email);
            seenCount++;
            result[resultCount] = customers[i];
            resultCount++;
        }
    }
    
    return resultCount;
}

int main() {
    char input[10000];
    fgets(input, sizeof(input), stdin);
    input[strcspn(input, "\n")] = 0;
    
    cJSON *json = cJSON_Parse(input);
    int n = cJSON_GetArraySize(json);
    
    Customer customers[1000];
    Customer result[1000];
    
    for (int i = 0; i < n; i++) {
        cJSON *item = cJSON_GetArrayItem(json, i);
        customers[i].customer_id = cJSON_GetObjectItem(item, "customer_id")->valueint;
        strcpy(customers[i].name, cJSON_GetObjectItem(item, "name")->valuestring);
        strcpy(customers[i].email, cJSON_GetObjectItem(item, "email")->valuestring);
    }
    
    int resultCount = solution(customers, n, result);
    
    cJSON *output = cJSON_CreateArray();
    for (int i = 0; i < resultCount; i++) {
        cJSON *obj = cJSON_CreateObject();
        cJSON_AddNumberToObject(obj, "customer_id", result[i].customer_id);
        cJSON_AddStringToObject(obj, "name", result[i].name);
        cJSON_AddStringToObject(obj, "email", result[i].email);
        cJSON_AddItemToArray(output, obj);
    }
    
    char *jsonString = cJSON_Print(output);
    printf("%s\n", jsonString);
    
    cJSON_Delete(json);
    cJSON_Delete(output);
    free(jsonString);
    
    return 0;
}