#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

double get_res(char *buff) {
    double arg;
    if (sscanf(buff, "sin(%lf)%*[ ]s=", &arg)) {
        char *nxt = strchr(buff, '=') + 1;
        *nxt = 0;
        return sin(arg);
    }
    if (sscanf(buff, "cos(%lf)%*[ ]s=", &arg)) {
        char *nxt = strchr(buff, '=') + 1;
        *nxt = 0;
        return cos(arg);
    }
    if (sscanf(buff, "tg(%lf)%*[ ]s=", &arg)) {
        char *nxt = strchr(buff, '=') + 1;
        *nxt = 0;
        return tan(arg);
    }
    if (sscanf(buff, "ctg(%lf)%*[ ]s=", &arg)) {
        char *nxt = strchr(buff, '=') + 1;
        *nxt = 0;
        return 1. / tan(arg);
    }
    return NAN;
}

int process(const char *in, const char *out) {
    FILE *fin = fopen(in, "r"),
            *fout = fopen(out, "w");

    if (!fin) {
        fclose(fout);
        return 0;
    }

    char buff[100];

    while (fgets(buff, 100, fin)) {
        double res = get_res(buff);
        if (isnan(res)) {
            fclose(fout);
            return 0;
        }
        fprintf(fout, "%s %lf\n", buff, res);
    }

    fclose(fin);
    fclose(fout);
    return 1;
}

int main(void) {
    if (!process("input.txt", "output.txt")) {
        printf("Error!\n");
    }

    return 0;
}